A car company hires a marketing firm to advertise a particular model of car. After a year the marketing company presents the following graph to show the increase in sales resulting from their advertising campaign.

Answer:

There's 3 questions which one do I answer?

Step-by-step explanation:

Answer:

The 90% confidence interval for the difference of the population means is approximately (-17.98, -2.02).

Step-by-step explanation:

Before building the confidence interval, we need to understand the central limit theorem and subtraction of normal variables.

Central Limit Theorem

The Central Limit Theorem estabilishes that, for a normally distributed random variable X, with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean [tex]\mu[/tex] and standard deviation [tex]s = \frac{\sigma}{\sqrt{n}}[/tex].

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

For a proportion p in a sample of size n, the sampling distribution of the sample proportion will be approximately normal with mean [tex]\mu = p[/tex] and standard deviation [tex]s = \sqrt{\frac{p(1-p)}{n}}[/tex]

Subtraction between normal variables:

When two normal variables are subtracted, the mean is the difference of the means, while the standard deviation is the square root of the sum of the variances.

Boys:

Mean of 75, sample of 45, standard deviation of 25.

This means that [tex]\mu_B = 75, s_B = \frac{25}{\sqrt{45}}[/tex]

Girls:

Mean of 85, sample of 30, standard deviation of 17.

This means that [tex]\mu_G = 85, s_G = \frac{17}{\sqrt{30}}[/tex]

Distribution of the difference of mean grades of boys and girls:

[tex]\mu = \mu_B - \mu_G = 75 - 85 = -10[/tex]

[tex]s = \sqrt{s_B^2+s_G^2} = \sqrt{(\frac{25}{\sqrt{45}})^2+(\frac{17}{\sqrt{30}})^2} = 4.85[/tex]

Confidence interval:

As stated, the critical value is [tex]z = 1.645[/tex]

The margin of error is of:

[tex]M = zs = 1.645*4.85 = 7.98[/tex]

Lower bound:

[tex]\mu - M = -10 - 7.98 = -17.98[/tex]

Upper bound:

[tex]\mu + M = -10 + 7.98 = -2.02[/tex]

The 90% confidence interval for the difference of the population means is approximately (-17.98, -2.02).

Answer:

Step-by-step explanation:

f(x) = -x^3+ 2x^2 - 3

Putting value of x = 2

F(2) = - (2)^3 + 2(2)^2 - 3

= - 8 + 8 - 3

= - 3

Option B is the correct answer

Answer:

15.25 km =15,250 m

so Jada ran further

Answer:

Jada ran farther

Step-by-step explanation:

First, convert 8,500 to kilometers.

8,500 ÷ 1,000 = 8.5

15.25 > 8.5

Have a wonderful day!

Answer:

228525-Look below for steps:)

Step-by-step explanation:

Step 1:

6925

*   33

______

Step 2:

5*3=15

carry the one

3*2+1=7

9*3=27

carry the 2

6*3+2=20

SO your first number is 20775 but we are NOT done yet!

add a zero below 5

5*3=15

carry the one

3*2+1=7

9*3=27 carry the 2

then 6*3+2=20

then add 207750+20775

which equals....

228525

so 228525 is your answer!!!

I really do hope this made sense!

Have a great day!

- Hailey: D

(NOTHING IS COPIED AND PASTED!!!!!)

Answer:

tanx=b/c

sinx=b/a

cosx=c/a

Step-by-step explanation:

Answer:

REVENGE

Step-by-step explanation:

9514 1404 393

Answer:

  A) a + s = 297

  B) 30a +20s = 6050

  C) 286 students

  D) 11 adults

Step-by-step explanation:

A) Total people is the sum of the numbers of adults and students:

  a + s = 297

__

B) Total revenue is the sum of revenue from each class of attendees:

  30a +20s = 6050

The solution is ...

  30a + 20(297 -a) = 6050 . . . there were 297-a students

  10a = 110 . . . . . . . . . . . . . . . . subtract 5940

  a = 11

  s = 297 -11 = 286

__

C) 286 students attended.

__

D) 11 adults attended.

Answer:

B

Step-by-step explanation:

The formula for the area of a triangle is given as:

A = ½*base*height

A = ½*b*h

A = (bh)2

If we know the area (A) and the base, to find the height, the following would be done:

Divide both sides by b

A/b = h/2

Multiply both sides by 2

[tex] \frac{A}{b} * 2 = h [/tex]

As we can see here, to find the base, we would divide the area by the vase, then multiply what we get by 2.

Answer:

They are all equal at the sides so , the answer is 4.8m , I think the perimeter is given just to confuse you.....

Answer:

Step-by-step explanation:

A hypotenuse is calculated on a triangle with a right angle. The hypotenuse is the side opposite the sides with the right angle. The equation is a^2 + b^2=c^2 where the hypotenuse is the square root of c.

She will need 6 yards. the permiter is 16 which 5 wouldnt be enough

addtion

becuase when you add the number of boys and girls together you get  the overall number of the class.

Answer: properties would be multiplication and the answer would be 40%

Step-by-step explanation: You can use cross multiplication to identify the answer to this.

Answer:

[tex]x=12.07[/tex]

Step-by-step explanation:

From the question we are told that:

Mean [tex]\=x =12cm[/tex]

Standard deviation [tex]\sigma=0.04[/tex]

Significance level [tex]\alpha=5\%=0.05[/tex]

Therefore

Confidence level [tex]95\%=0.95[/tex]

From table [tex]P(z<1.645)=0.95[/tex]

Generally the equation for Z-score is mathematically given by

[tex]z=\frac{x-\mu}{\sigma}[/tex]

[tex]x=z\sigma+\mu[/tex]

[tex]x=1.645*0.04+12[/tex]

[tex]x=12.07[/tex]

Answer:

C. Associative property of multiplication

Step-by-step explanation:

The associative property of multiplication states that the way in which factors are grouped in a multiplication problem does not change the product.

Answer:

3 and 5 the two middle numbers

median is the middle number in a sequence

Answer:

5

Step-by-step explanation:

First we put all the numbers in order like so: 3,4,5,5,6,7

If we had a odd number of numbers we would just pick the middle one

But since here we have 6 numbers its even so 5 and 5 come in the middle so it is automatically 5.

Hope I could help!

Answer:

Mean - 1.5

Median - 1.5

Step-by-step explanation:

Median = middle number

Means = all numbers added up and divided by how many are there

Answer:

Hence, the list ten different possible outcomes are [tex](1,2),(1,3),(1,4),(1,5),(2,3),(2,4),(2,5),(3,4),(3,5),(4,5)[/tex], the probability distribution of X are [tex]0.3,0.6,0.1[/tex] and the cumulative distribution function is [tex]F(x)=\left\{\begin{array}{lc}0 & x<0 \\0.3 & 0 \leq x<1 \\0.9 & 1 \leq x<2 \\1 & 2 \leq x\end{array}\right.[/tex]

Step-by-step explanation:

(a)

List the ten different possible outcomes.

The number of ways that two boards are drawn from each lot of [tex]5[/tex] lots are [tex]{5 \choose 2}[/tex]

    [tex]{5 \choose 2}=\frac{5!}{2!(5-2)!}[/tex]

[tex]\Rightarrow {5 \choose 2}=\frac{5\times 4\times 3!}{2!\times 3!}[/tex]

[tex]\Rightarrow {5 \choose 2}=\frac{5\times 4}{2!}[/tex]

[tex]\Rightarrow {5 \choose 2}=\frac{20}{2}[/tex]

[tex]\Rightarrow {5 \choose 2}=10[/tex]

So, the [tex]10[/tex] combinations are as follows :

[tex](1,2),(1,3),(1,4),(1,5),(2,3),(2,4),(2,5),(3,4),(3,5),(4,5)[/tex]

(b)

The aim is to find the probability distribution when two boards are chosen at random and board's one and two is the only defective boards.

Let X be the number of defective boards in the lot.

Therefore, select the combinations of the boards that are without 1 and 2 from 10 combinations.

Compute the [tex]P(X=0)[/tex]

 [tex]P(X=0)=P\{(3,4),(3,5),(4,5)\}[/tex]

                 [tex]=\frac{3}{10}[/tex]

                 [tex]=0.3[/tex]

The probability that defectives did not occur in the lot is 0.3

Compute the [tex]P(X=1)[/tex]

Select the combinations of the boards that are with one defective either 1 and 2 from the 10 combinations.

[tex]P(X=1)=P\{(1,3),(1,4),(1,5),(2,3),(2,4),(2,5)\}[/tex]

                [tex]=\frac{6}{10}[/tex]

                [tex]=0.6[/tex]

The probability that one defectives occurred in the lot is 0.6.

Compute the [tex]P(X=2)[/tex]

Select the combinations of the boards that are with two defective 1 and 2 from the 10 combinations.

[tex]P(X=2)=P\{(1,2)\}[/tex]

                [tex]=\frac{1}{10}[/tex]

                [tex]=0.1[/tex]

The probability that two defectives occurred in the lot is 0.1.

(c)

The cumulative distribution function (cdf)[tex]F(X=x)[/tex]  is defined as,

[tex]\begin{aligned}F(X&=x)=P(X \leq x) \\F(0) &=P(X \leq 0) \\&=P(X=0) \\&=0.3 \\F(1) &=P(X \leq 1) \\&=P(X=0)+P(X=1) \\&=0.3+0.6 \\&=0.9 \\F(2) &=P(X \leq 2) \\&=P(X=0)+P(X=1)+P(X=2) \\&=0.3+0.6+0.1 \\&=1.0\end{aligned}[/tex]

Therefore, the cumulative distribution function (cdf) [tex]F(X=x)[/tex] is,

[tex]F(x)=\left\{\begin{array}{lc}0 & x<0 \\0.3 & 0 \leq x<1 \\0.9 & 1 \leq x<2 \\1 & 2 \leq x\end{array}\right.[/tex]

Answer:

1. x - 5 = 20

2. x + 2y = -6

3. 5x² = 12

Step-by-step explanation:

1. 5 less than x is 20

x - 5 = 20

2. the sum of x and twice y equals -6

x + 2y = -6

3. the product of 5 and x squared results in 12

5x² = 12

Answer:

there is no profit there is loss because CP is greater than SP

Step-by-step explanation:

loss=CP-SP

=Rs480-Rs420

=Rs60

loss%=loss/cp*100%

=60/480*100%

=6000/480

=12.5%

Answer:

720

Step-by-step explanation:

I think you just have to do

6x8x3x5

Answer:

8.56 x 2.1 = 17.967 or you can sum up to 18. Hope this helps!

Answer:

B. 24

Step-by-step explanation:

Answer:

a) what is the point estimate used to create this confidence interval?

[a] 0.22

[b] 0.28

[c] 0.26

[d] 0.25  <-----------------------------

b) what is the margin of error used to create this confidence interval?

[a] .06

[b] .03    <-----------------------------

[c] .035

[d] .055

c) based on the confidence interval, it is plausible that the true proportion of adult males who smoke cigarettes is 27%?

[a] yes   <-------------------------------

[b] no

Step-by-step explanation:

Answer:

2 solutions

-1 and 2

Step-by-step explanation:

Answer:

V=lwh /3

Step-by-step explanation:

Answer:

3 days

Step-by-step explanation:

well, in 2 days mitch can jar 12 liters of jam right? but 12 is divisible by 2. so let’s just do that to help us out later, 12 / 2 = 6

now that we have that, let’s make sure. in 1 day he can jar 6, in 2 he can jar 12.

that seems right! so now, can we add 6 to 12 to make 18? yep! how many more times do we need to add 6? 1 time. so 12 + 6 = 18. every 6 liters is 1 day. so 1 day + 1 day + 1 day (18 liters) is 3 days total!

hope this helped you!