Answer:
For each of the sample sizes given, for the population to be regarded as effectively infinite, student population has to be more than
a) 240 students.
b) 1,040 students.
c) 1,920 students.
Step-by-step explanation:
A population may be treated as infinite when the population size, N, is at least 20 times the sample size, n.
Mathematically,
(N/n) > 20
N > 20n
(a) A sample of 24 students.
If sample size = n = 24
For the population size to be effectively infinite,
N > 20n
N > 20×24
N > 480 students
(b) A sample of 52 students.
If sample size = n = 52
For the population size to be effectively infinite,
N > 20n
N > 20×52
N > 1,040 students
(c) A sample of 96 students.
If sample size = n = 96
For the population size to be effectively infinite,
N > 20n
N > 20×96
N > 1,920 students
Hope this Helps!!!
A coin will be flipped repeatedly until the sequence TTH (tail/tail/head) comes up. Successive flips are independent, and the coin has probability p of coming up heads. Let N,TTH be the number of coin flips until TTH first appears. What value of p minimizes Ex[N,TTH]
Answer:
[tex]P = \frac{1}{3}[/tex]
Step-by-step explanation:
The calculation of the value of p minimizes is shown below:-
We will assume the probability of coming heads be p
p(H) = p
p(T) = 1 - P
Now, H and T are only outcomes of flipping a coin
So,
P(TTH) = (1 - P) = (1 - P) (1 - P) P
= (1 + P^2 - 2 P) P
= P^3 - 2P^2 + P
In order to less N,TTH
we need to increase P(TTH)
The equation will be
[tex]\frac{d P(TTH)}{dP} = 0[/tex]
3P^2 - 4P + 1 = 0
(3P - 1) (P - 1) = 0
P = 1 and 1 ÷ 3
For P(TTH) to be maximum
[tex]\frac{d^2 P(TTH)}{dP} < 0 for\ P\ critical\\\\\frac{d (3P^2 - 4P - 1)}{dP}[/tex]
= 6P - 4
and
(6P - 4) is negative which is for
[tex]P = \frac{1}{3}[/tex]
Customers arrive at a movie theater at the advertised movie time only to find that they have to sit through several previews and prepreview ads before the movie starts. Many complain that the time devoted to previews is too long. A pre-liminary sample conducted by The Wall Street Journal showed that the standard deviation of the amount of time devoted to previews was 6 minutes. A. If we want to estimate the population mean time for previews at movie theaters with a margin of error of 72 seconds, what sample size should be used? B. If we want to estimate the population mean time for previews at movie theaters with a margin of error of 1 minute, what sample size should be used?
Answer:
Using a 90% confidence level
A. A sample size of 68 should be used.
B. A sample size of 98 should be used.
Step-by-step explanation:
I think there was a small typing mistake and the confidence level was left out. I will use a 90% confidence level.
We have that to find our [tex]\alpha[/tex] level, that is the subtraction of 1 by the confidence interval divided by 2. So:
[tex]\alpha = \frac{1-0.9}{2} = 0.05[/tex]
Now, we have to find z in the Ztable as such z has a pvalue of [tex]1-\alpha[/tex].
So it is z with a pvalue of [tex]1-0.05 = 0.95[/tex], so [tex]z = 1.645[/tex]
Now, find the margin of error M as such
[tex]M = z*\frac{\sigma}{\sqrt{n}}[/tex]
In which [tex]\sigma[/tex] is the standard deviation of the population and n is the size of the sample.
A. If we want to estimate the population mean time for previews at movie theaters with a margin of error of 72 seconds, what sample size should be used?
We have the standard deviation in minutes, so the margin of error should be in minutes.
72 seconds is 72/60 = 1.2 minutes.
So we need a sample size of n, and n is found when M = 1.2. We have that [tex]\sigma = 6[/tex]. So
[tex]M = z*\frac{\sigma}{\sqrt{n}}[/tex]
[tex]1.2 = 1.645*\frac{6}{\sqrt{n}}[/tex]
[tex]1.2\sqrt{n} = 6*1.645[/tex]
[tex]\sqrt{n} = \frac{6*1.645}{1.2}[/tex]
[tex](\sqrt{n})^{2} = (\frac{6*1.645}{1.2})^{2}[/tex]
[tex]n = 67.65[/tex]
Rounding up.
A sample size of 68 should be used.
B. If we want to estimate the population mean time for previews at movie theaters with a margin of error of 1 minute, what sample size should be used?
Same logic as above, just use M = 1.
[tex]M = z*\frac{\sigma}{\sqrt{n}}[/tex]
[tex]1 = 1.645*\frac{6}{\sqrt{n}}[/tex]
[tex]\sqrt{n} = 6*1.645[/tex]
[tex](\sqrt{n})^{2} = (6*1.645)^2[/tex]
[tex]n = 97.42[/tex]
Rounding up
A sample size of 98 should be used.
THE VALUE OF (-3)raised to 4 is
Step-by-step explanation:
81
I think this should be the answer
The population of Adamsville grew from 6000 to 13000 in 7 years. Assuming uninhibited exponential growth, what is the expected population in an additional 3 years?
Answer:
18107.32
Step-by-step explanation:
Set up the exponential function in the form:
[tex]P = P_0(R)^t[/tex]
so P is the new population, [tex]P_0[/tex] is the original population, R is the rate of increase in population, and t is the time in years.
You have to use the information given to find the rate that the population is increasing and then use that rate to find the new population after more time passes.
[tex]13000 = 6000(R)^7\\\\\\frac{13000}{6000} = R^7\\\\\sqrt[7]{\frac{13000}{6000} } = R\\\\\\ R = 1.116786872[/tex]
Now that you found the rate, you can use the function to find the population after another 3 years.
[tex]P = 13000(1.116786872)^3\\P = 18107.32317\\[/tex]
So the population is 18107, rounded to the nearest whole number.
Kip is going to meet his family.
The table shows the number of
kilometers he needs to travel until he
reaches them.
Hour
1
2
3
4
5
6
7
Kilometers
151
131
111
91
71
51
M
Answer:
From my knowledge I would say M= 31 km
Step-by-step explanation:
For each hour you subtract 20 kilometers.
Since the sixth hour was 51 kilometers,to find how many kilometers for the seventh hour we simply subtract 20 from 51.
51- 20 = 31
I really hope this helps:)
Monique only has $36 to buy pens and notebooks. Each pen costs $2. Each
notebook costs $3. Which of the following graphs represents the possible
combinations of pens and notebooks that she may purchase?
Answer:
B.
Step-by-step explanation:
Let's call x the number of pens and y the number of notebooks that Monique can buy.
If each pen costs $2 and each notebook costs $3, so she is going to spend 2*x on pens and she is going to spend 3*y on notebooks.
Additionally, she is going to spend a maximum of $36. so:
2x + 3y [tex]\leq[/tex] 36
It means that the line that separated the region is:
2x + 3y = 36
This is the same that a line that passes for the points (0,12) and (18,0) or the line of the region B
The top speed you will ever need
to go in a parking lot is
O A. 20 mph
OB. 10 mph
OC. 1 mph
D. 15 mph
Answer:
10 mph
Step-by-step explanation:
The top speed you will ever need to go in a parking lot is 10 mph.
15 mph is the fastest you should ever drive in a parking lot. The right answer is D.
What is National Motorists Association?The National Motorists Association was established in 1982 and is a divisive nonprofit advocacy group representing drivers in North America.
The Association promotes engineering standards that have been demonstrated to be effective, justly drafted and applied traffic legislation, and full due process for drivers.
Given to give information about the top speed you will ever need
to go into a parking lot is,
A group of drivers came together to form the National Motorists Association, Inc., a non-profit organization, to defend drivers' rights in the legal system, on the highways, and inside our cars.
Usually, there are marked speed limits in parking lots. Obey speed limits when you see them to avoid tickets and to keep everyone safe.
The National Motorists Association advises driving no faster than 15 miles per hour at all times when there are no written speed limits.
Therefore, the correct option is D.
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Eight times the difference of y and nine
Answer:
(y-9)8
Step-by-step explanation:
you first solve 8-9, and then multiply is by 8.
Eight times the difference of y and nine will be 8(y - 9).
It should be noted that eight times the difference of y and nine simply means that one has to subtract 9 from y and then multiply the difference by 8.
Therefore, eight times the difference of y and nine will be 8(y - 9).
In conclusion, the correct option is 8(y - 9).
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The side lengths of a square increase at a rate of 4cm/s. Find the rate at which the area of the square is increasing when the side length is 2cm. g
Answer:
4 cm^2/cm
Step-by-step explanation:
The area of a square is given by the equation:
[tex]Area = side^2[/tex]
To find the rate at which the area increases, we just need to find the derivative of the area in relation to the side:
[tex]dA/ds = 2*side[/tex]
So, when the side length is 2 cm, the rate at which the area increases is:
[tex]dA/ds = 2*2 = 4\ cm^2/cm[/tex]
When the side length is 2 cm, the area increases at 4 cm^2/cm.
The largest fish ever caught in Lake A weighed 650 pounds. This is 208.2 pounds less than seven times the weight of the largest fish ever caught in Lake B. Find the weight of the largest fish caught in Lake B nts
Answer:
122.6 pounds
Step-by-step explanation:
Let's call the weight of the largest fish from lake A 'x', and the weight of the largest fish from lake B 'y'.
If x is 208.2 pounds less than seven times y, we have that:
[tex]x = 7y - 208.2[/tex]
We know that x is equal 650 pounds, so we can find y:
[tex]650 = 7y - 208.2[/tex]
[tex]7y = 650 + 208.2[/tex]
[tex]7y = 858.2[/tex]
[tex]y = 122.6\ pounds[/tex]
So the weight of the largest fish caught in Lake B is 122.6 pounds
What is the smallest sample size required to provide a 95% confidence interval for a
mean, if it important that the interval be no longer than 1cm? You may assume that the
population is normal with variance 9cm2.
Answer:
Don't quote me i think the poulation of 3
Step-by-step explanation:
for 9 suared is 81 so it cant be squared for then it would be 81cm and the one you need can not be longer than 1cm
The minimum sample size should be 35.
What is Confidence Interval?The mean of your estimate plus and minus the range of that estimate constitutes a confidence interval. Within a specific level of confidence, this is the range of values you anticipate your estimate to fall within if you repeat the test.
Given:
Variance= 9
So, standard deviation= √9 = 3
and, The critical z-score values when using a 95 percent confidence level are -1.96 and +1.96 standard deviations.
Then, Sample size= Critical value x SD / Margin error
= 1.96 x √ 3 / 139
= 34.57
= 35
Hence, the minimum sample size should be 35.
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Find the area:
A.16
B.64
C.256
D.none of these
Answer:
64π in²
Step-by-step explanation:
The area of a circle is given by the formula ...
A = πr²
where r is the radius.
The radius of a circle is half the diameter. For the circle shown, the radius is ...
r = d/2 = (16 in)/2 = 8 in
Then the area is ...
A = π(8 in)² = 64π in²
_____
Often, units are left off, so the appropriate choice might be 64π.
_____
If you want to be technically correct (at the expense of getting your answer marked wrong), you can select "None of the above." That is because none of the offered choices have the correct units: square inches. You may want to discuss this with your teacher.
a family has five children. the probability of having a girl is 1/2. whats probability of having at leasr 4 girls g'
Answer:
Probability of having at least 4 Girls
= 0.6875
Step-by-step explanation:
Probability of having at least 4 Girls is 1-probability of having exactly 3 girls
Total number of children= 5 = N
Probability of having a girl p = 0.5
Probability of not having a girl q= 0.5
X= 3
Probability of at least 4 girls is given by
Probability= NCX(p)^x(q)^(N-x)
Probability = 5C3(0.5)^3(0.5)^(5-3)
Probability = 5C3(0.5)^3(0.5)^2
Probability= 5!/3!2!(0.5)^3(0.5)^2
Probability= 10(0.125)(0.25)
Probability= 0.3125
Probability of having at least 4 Girls
= 1- 0.3125
= 0.6875
Individuals filing federal income tax returns prior to March 31 received an average refund of $1056. Consider the population of "last-minute" filers who mail their tax return during the last five days of the income tax period (typically April 10 to April 15).
a. A researcher suggests that a reason individuals wait until the last five days is that on average these individuals receive lower refunds than do early filers. Develop appropriate hypotheses such that rejection of H0 will support the researcher’s contention.
b. For a sample of 400 individuals who filed a tax return between April 10 and 15, the sample mean refund was $910. Based on prior experience a population standard deviation of σσ = $1600 may be assumed. What is the p-value?
c. At αα = .05, what is your conclusion?
d. Repeat the preceding hypothesis test using the critical value approach.
The α = 0.05 and the p-value (0.034) is less than α, we reject the null hypothesis. There is sufficient evidence to support the researcher's contention that last-minute filers receive lower average tax refunds than early filers. Since the test statistic is more extreme than the critical value, we reject the null hypothesis.
a.
Hypotheses:
Null Hypothesis [tex](H_0)[/tex]: There is no difference in the average tax refund amount between early filers and last-minute filers .
Alternative Hypothesis [tex](H_a)[/tex]: Last-minute filers receive lower average tax refunds than early filers.
Mathematically:
[tex]H_0[/tex]: μ_last_minute = μ_early
[tex]H_a[/tex]: μ_last_minute < μ_early
where:
μ_last_minute = population mean refund for last-minute filers
μ_early = population mean refund for early filers
b.
Given information:
Sample mean for last-minute filers = $910
Population standard deviation (σ) = $1600
Sample size (n) = 400
To calculate the test statistic and the p-value, use the formula:
[tex]z = (\bar x - \mu) / (\sigma / \sqrt n)[/tex]
Where:
[tex]\bar x[/tex] = sample mean
μ = hypothesized population mean under the null hypothesis
σ = population standard deviation
n = sample size
Plugging in the values:
z = ($910 - $1056) / ($1600 / √400)
z = ($910 - $1056) / ($1600 / 20)
z = -$146 / 80
z ≈ -1.825
c.
To find the p-value associated with the test statistic, use a standard normal distribution table. For a one-tailed test with a z-score of -1.825, the p-value is approximately 0.034.
d.
Critical value approach:
To perform the hypothesis test using the critical value approach, we first need to find the critical value corresponding to α = 0.05 and a one-tailed test.
For a significance level (α) of 0.05, the critical value is approximately -1.645.
Now, the test statistic we calculated previously was -1.825.
Conclusion: The p-value is less than α, we reject the [tex](H_0)[/tex].There is sufficient evidence to support the researcher's contention that last-minute filers receive lower average tax refunds than early filers. Since the test statistic is more extreme than the critical value, we reject the null hypothesis.
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What is the slope of the line shown? The graph of a line passes through the points (0, -2) and (6, 0). What is the equation of the line? please help fast 20 pt will mark the branliest
Answer:
slope = 1/3, equation is y = 1/3x - 2
Step-by-step explanation:
slope formula = change in y / change in x
= (0 - (-2)) / (6 - 0) = 2 / 6 = 1/3
Since we know the slope and the y-intercept we can write the equation in slope-intercept form which will be y = 1/3x - 2.
Answer:
y=1/3x -2
Step-by-step explanation:
points (0, -2) and (6, 0)
Slope- intercept form:
y=mx+b
m=(y2-y1)/(x2-x1)= (0+2)/(6-0)= 2/6= 1/3y=1/3x+b
0= 1/3*6+b b= -2y=1/3x -2
which inequality represents the statement? the number of new cars(C) a ship carries cant exceed 975.
A. c<975
B. c>975
C. c<(—under<)975
D. c>(—under>)975
"can't exceed 975" means this is the largest value possible for C. So we could have C = 975 or smaller. We write this as [tex]C \le 975[/tex] which is read as "C is less than or equal to 975".
Answer: Choice C. [tex]C \le 975[/tex]Answer:
5
Step-by-step explanation:
El costo de pintar un muro se calcula con un tercio del doble del área por el triple del numero de trabajadores. Si se planea pintar un muro de 1200m² y se contrataran a 3 trabajadores. ¿Cuanto se pagara?
Answer:
Se pagará $7200.
Step-by-step explanation:
La ecuación del costo puede descomponerse en dos factores que luego se multiplican:
1) Siendo A el area del del muro, la parte del costo que depende del área se calcula como un tercio (1/3) del doble (2) del área A. Este factor se puede escribir como:
[tex]C_1=(1/3)\cdot 2 \cdot A=(2/3)\cdot A[/tex]
2) Siendo T el número de trabajadores, el siguiente factor es el triple del numero de trabajadores T. Esto es:
[tex]C_2=3T[/tex]
Multiplicando ambos factores, tenemos la ecuacion del costo en función de A y T:
[tex]C=C_1\cdot C_2=(2/3)A\cdot 3T=2 AT[/tex]
Si se planea pintar un muro de 1200m² y se contrataran a 3 trabajadores, el costo será:
[tex]C=2AT=2(1200)(3)=7200[/tex]
If you vertically stretch the exponential function f(x) = 2^x by a factor of 3, what
is the equation of the new function?
A. f(x) = 5^x
B. f(x) = 2(3^x)
C. f(x) = 3(2^x)
D. f(x) = 6^x
Answer: [tex]C. f(x) = 3(2^x)[/tex].
Step-by-step explanation:
If the graph of function y=f(x) is vertically stretched by a scale factor of 'k', then the new function will be :
[tex]Y=kf(x)[/tex]
The given function : [tex]f(x)=2^x[/tex]
If the given function vertically stretched by a scale factor of '3', then the new function will be :
[tex]Y=3f(x)=3(2^x)[/tex]
Hence, the correct option is [tex]C. f(x) = 3(2^x)[/tex].
Sample data for the arrival delay times (in minutes) of airlines flights is given below. Determine whether they appear to be from a population with a normal distribution. Assume that this requirement is loose in the sense that the population distribution need not be exactly normal, but it must be a distribution that is roughly bell-shaped Click the icon to view the data set. Is the requirement of a normal distribution satisfied? A. No, because the histogram of the data is not bell shaped, there is more than one outlier, and line points in the normal quantile plot do not lie reasonably close to a straight line.B. Yes, because the histogram of the data is bell shaped, there are less than two outliers, and the line points in the normal quantile plot lie reasonably close to a straight line.C. Yes, because the histogram of the data is not bell shaped, there is more than one outlier, and line points in the normal quantile plot do not lie reasonably close to a straight line.D. No, because the histogram of the data is bell shaped, there are less than two outliers, and the the points in the normal quantile plot do not lie reasonably close to a straight
Answer:
(Option A) . No, because the histogram of the data is not bell shaped, there is more than one outlier, and line points in the normal quantile plot do not lie reasonably close to a straight line.
Step-by-step explanation:
After plotting the histogram, you will see that the data does not represent the normal distribution because the histogram is not bell shaped and there are two outliers.
Caleb puppy weighs 2250 grams if the puppy weight 600 grams at the last visit to the vets office what is the percent increase in the puppy's weight rounded to the nearest whole number
Answer: 375%
Step-by-step explanation:
375%. Simply do 2250/600 to get 3.75, or 375%.
Hope it helps <3
A business offers educational tours to Patagonia, a region of South America that includes parts of Chile and Argentina. The profit P for x number of persons is P(x) = −25x^2 + 1250x − 5000. The trip will be rescheduled if the profit is less than $7500. How many people must have signed up if the trip is rescheduled?
Answer:
13.82 or 14 people
Step-by-step explanation:
Step 1: Set equation equal to 7500
7500 = -25x² + 1250x - 5000
Step 2: Solve
0 = -25x² + 1250x - 12500
0 = -25(x² - 50x + 500)
0 = x² - 50x + 500
When you use the quadratic formula, you should get 13.82, rounded to 14 people as your answer.
Alternatively, we can graph the expression and see where $7500 for x people is.
CAN I GET HELP I DONT LIKE WAITING TY
Answer:
Answer D: Construct Y because it constructs the circumcenter.
Step-by-step explanation:
Point E has equal distance to L,M and N, because it is the center of a circle that goes through all 3 of them. The circumcenter is the center of a circle circumscribed about (drawn around) the triangle.
I need help please!!!!
Answer:
1/3( x-5)= -2/3
Multiply both sides by 3
x = 3
Step-by-step explanation:
1/3( x-5)= -2/3
Multiply both sides by 3
3*1/3( x-5)= -2/3*3
x-5 = -2
Add 5 to each side
x-5+5 = -2+5
x = 3
Answer:
1/3( x-5)= -2/3
Multiply both sides by 3
x = 3
Step-by-step explanation:
1/3( x-5)= -2/3
Multiply both sides by 3
3*1/3( x-5)= -2/3*3
x-5 = -2
Add 5 to each side
x-5+5 = -2+5
x = 3
Hope this helps!
True or False?
2 is a solution to 8m - 6 < 10
True
False
Answer:
2 is not a solution
False
Step-by-step explanation:
8m - 6 < 10
Add 6 to each side
8m -6+6 < 10+6
8m < 16
Divide by 8
8m/8 <16/8
m < 2
m must be less than 2
2 is not a solution
Answer:
FALSE
Step-by-step explanation:
Trust Me
Please answer this correctly
Answer:
2/3
Step-by-step explanation:
There are 4 numbers that fit the rule, 3, 4, 7, 8 since they are either less than 5 or greater than 6. There are 6 numbers so the chance would be 4/6 or simplified, 2/3.
Answer:
2/3
Step-by-step explanation:
There are 6 options, 2 of them > 6 and 2 of them < 5
P (greater than 6 or less than 5)= 4/6= 2/3
Multiply.
(3x+ 5)(3х - 5)
Answer:
9x^2-25
Step-by-step explanation:
You can solve this problem by using FOIL:
- FOIL (First, Outer, Inner, Last)
First: 3x*3x= 9x^2
Outer: 3x*-5= -15x
Inner: 3x*5 = 15x
Last: 5*-5= -25
Now add what we got together:
9x^2 -15x +15x -25
Answer: 9x^2 - 25
Note: Whenever when we see conjugates(coefficients of variables are same but real numbers are opposites) like these we can ignore the outer and inner of the foil process as they cancel out.
Hope this helps!
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[tex]9x^2 - 25[/tex]
Explanation:
[tex]( a + b) ( a - b ) = a^2 - b^2[/tex]
Substitute with 3x and b with 5:
[tex](3x + 5) (3x - 5) = (3x)^2 - 5^2\\[/tex]
[tex]= 9x^2 - 25[/tex]
∴ [tex]( 3x + 5) ( 3x - 5) = 9x^2 - 25[/tex]
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Hope this helped you.
Could you maybe give brainliest..?
❀*May*❀
Find the value of x and simplify completely.
Answer:
x=9√10Given: A right triangle in which an altitude is drawn from the right angle vertex to the hypotenuse.
To find: 'x' the larger leg of triangle
Solution,
Using let rule for similarity in right triangle:
[tex] \frac{leg}{part} = \frac{hypotenuse}{leg} \\ or \: \frac{x}{27} = \frac{3 + 27}{x} \\ or \: x \times x = 27(3 + 27) \\ or \: x \times x = 81 + 729 \\ or \: {x}^{2} = 810 \\ or \: {x}^{2} = 81 \times 10 \\ or \: {x} = \sqrt{81 \times 10} \\ or \: x = \sqrt{81} \times \sqrt{10} \\ or \: x = \sqrt{ {(9)}^{2} } \times \sqrt{10} \\ \: x = 9 \sqrt{10} [/tex]
Hope this helps...
Good luck on your assignment..
A market researcher finds the price of several brands of fabric softener. What is the level of measurement of the data?
Answer:
ratio
Step-by-step explanation:
The levels of measurement are ...
NominalOrdinalIntervalRatioBoth interval and ratio level measurements deal with numerical data. The difference is that ratio-level measurements use a numerical scale that includes an absolute zero, and scale values are proportional to the quantity they represent.
Price data is a ratio level of measurement.
Select the fraction that is equivalent to 2/6 ?
Answer:
The fraction that is equivalent to 2/6 is 1/3
(x + 1) (x+8) multiply binomials and put in standard form.
Answer:
x² + 9x + 8
Step-by-step explanation:
Step 1: FOIL
x² + 8x + x + 8
Step 2: Combine like terms
x² + 9x + 8
Answer:
x^2 + 9x + 8
Step-by-step explanation:
(x + 1)(x + 8)
x(x + 1) +8(x + 1)
x^2 + x + 8x +8
x^2 + 9x + 8