Mathematics High School

A clinical trial tests a method designed to increase the probability of conceiving a girl. In the study 620 babies were born, and 341 of them were girls. Use the sample data to construct a 99% confidence interval estimate of the percentage of girls born. Based on the result, does the method appear to be effective?

Answers

Answer 1

Answer:

Based on the confidence interval, the method appears to not bring expected results

Step-by-step explanation:

The given parameters are;

The number of babies in the study, n = 620 babies

The number of girls in the study sample = 341 girls

The proportion of girls in the study sample, [tex]\hat p[/tex] = 341/620 = 0.55

At 99% confidence level, we have the critical z = 2.576;

The confidence interval is given by the following formula;

[tex]CI=\hat{p}\pm z\times \sqrt{\dfrac{\hat{p} \cdot (1-\hat{p})}{n}}[/tex]

Plugging in the values of the variables, we get;

[tex]CI=0.55\pm 2.576\times \sqrt{\dfrac{0.55 \times (1-0.55)}{620}} \approx 0.55 \ \pm 5.14680 \times 10^{-2}[/tex]

Therefore, 0.498532 < p < 0.601468

Based on the result of the confidence interval, we can be 99% sure that the true mean is between 0.498532 and 0.601468, therefore, given that the range includes a true mean of 0.5 or 50% probability of conceiving a girl, which is the percentage predicted by genetics, the method appears ineffective

Related Questions

Pls solve this i need help quick

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Answer:

13 is the answer

Step-by-step explanation:

m = 13

(8+5)

can somebody help I am really bad at this

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Answer:

40 feet

Step-by-step explanation:

4+4+8+4+12+8

= 40 ft.

A string reaches from the top of a 17-foot pole to a point 13 feet from the base of the pole. To the nearest tenth of a foot, how long is the string?

Answers

Answer:

21.4 feets

Step-by-step explanation:

Using Pythagoras rule :

The length of the string:

Hypotenus = sqrt(opposite² + adjacent²)

Length of string = sqrt(17² + 13²)

Length = sqrt(289 + 169)

Length of string = sqrt(458)

Length of string = 21.400

Length = 21.4 feets

Help please please this is a big grade !!

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Answer:

10=480 cupcakes 864=18 boxes 24=1152 cupcakes 1536=32 boxes

Step-by-step explanation:

PLEASE HELP! SEE PICTURE!

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Answer:

uhhhhhhhhh

Step-by-step explanation:

Find the surface area of the regular pyramid.
14 cm
11 cm

Answers

Answer: you on this to

Step-by-step explanation:

State of the triangles in each pair are similar. If so, state how you know they are similar and complete the similarity statement.

Answers

Answer:

SSS, UVD, the answer is D

Step-by-step explanation:

90/9 = 10

70/7 = 10

80/8 = 10

triangle LMN congruent triangle UVD

what’s the domain and range of this graph?

Answers

Answer:domain: (−∞,∞)

range: [−9,∞)

Step-by-step explanation:

The area of a rhombus is 60 cm one diagonal is 10cm other dignonl is

Answers

Answer: 12 cm

Explanation: The other diagonal is 12 cm as I calculated.

PLEASE HELP

The graph of y = f(x) is shown below. What are all of the real solutions of
f(x) = o?

Answers

Answer:

The real solutions are : -6, -3 and 2

Step-by-step explanation:

The solutions of a functions are the input values at an output zero

Graphical wise, this can be represented by the order pairs (x, 0)

In other words, these are the points that lie on the x-axis

Examining the given graph, we can see that the points lying on the x-axis are:

(-6, 0), (-3, 0) and (2, 0)

This means that:

The real solutions of the function are:

-6, -3 and 2

Hope this helps :)

What is the decimal equivalent of 13/4?

Answers

Answer:

3.25

hope this helped!!

Answer:

3.25

Step-by-step explanation:

13 / 4 is an improper fraction . when you divide 13 by 4 you get 3.25

It takes Jason 30 minutes to wash the dishes, but it takes 50 minutes for his younger brother. How many minutes will it take to wash the dishes if they work together? Round your answer to the nearest hundredth if necessary.

Answers

At the 2 together and then divide by 2 to find the average (40)

Ralph buys a computer for $675. The sales tax rate is 6%. How much did Ralph pay for
the computer?
Answers choices are
A.$40.50
B.$715.50
C. $6.00
D.634.50

Answers

Answer:

uhhhh D?

Step-by-step explanation:

Solve: please, THANKS

Answers

Answer:

20/21

Step-by-step explanation:

have a nice day or evening

A car is 160 inches long.

A truck is 10% longer than the car.

How long is the truck?

Answers

Answer:

im pretty sure its 170 inches long

Step-by-step explanation:

Answer:

176 Inches long.

Step-by-step explanation:

160 multiplied by .1 gets you 10% then add 160 to 16 to get 176.

What is the best measure of center for this data?

{101, 2, 108, 104, 102, 107, 109, 102}
Question 5 options:

A. mean or median because there is no outlier

B. median because there is an outlier

C. mean because there is an outlier

D. mode because there is an outlier

Answers

Answer:

The answer is A

Becaise Mode is not a measure of centre, and Mean is dramatically changed with the outli

I think that would be correct, Hope it helps!!!

Find the degree measure of the angle expressed by 11x-6.

Answers

Answer:

Won't it just be 60, because it's an equilateral triangle.

Step-by-step explanation:

60 + 60 = 120

180 - 120 = 60

11x - 6 = 60

11x = 66

x = 66/11

x = 6

Let's substitute.

11(6) - 6 = 66 - 6 = 60

First three terms of n^2+40
How many terms in the sequence are less than 100?

Answers

Answer:

Step-by-step explanation:

If N= 1, 2, 3, 4, 5, 6, or 7, the equation is still less than 100.

Complete a function table from an equation
Complete the table.

Answers

The answers are 8,2,-4,-10

Two triangles are similar. The corresponding sides have a ratio of 2:5. If the larger triangle has a side length of 55 centimeters, what is the measurement of the corresponding side of the smaller triangle?
A.33 cm
B. 22
C.27
D.19cm

Answers

B (22cm)

2:5
55/5 = 11
11 * 2 = 22

Anyone know the answers to any of these questions? Please if u do help me out I’m stuck lol it’s due tomorrow and I don’t wanna get detention for it someoneeee??... anyoneeee...

Answers

Question 3 is 12:2 because if you divided 108 by 9 you get 12 and 18 by 9 you get 2

Anna put $500 into a savings account and made no more deposits or withdrawals. The account earns 2% simple interest per year. How much money will be in the account after 5 years?

Answers

Answer:

Step-by-step explanation:

What I did was 2 divided by 100 = 0.02 Then multiply 0.02 times 500 and you should get 10 then multiply by how many years of interest and you get 50

hope this helped!

Evaluate.0.2 power of 4 =

Answers

Answer:

0.0016

Step-by-step explanation:

The expression 0.2 by the power of 4 when evaluated has a value of 0.0016

How to evaluate the expression

From the question, we have the following parameters that can be used in our computation:

0.2 by the power of 4

Express as an equation

So, we have

0.2 by the power of 4 = 0.2⁴

When expanded, we have

0.2 by the power of 4 = 0.2 * 0.2 * 0.2 * 0.2

Evaluate the products

This gives

0.2 by the power of 4 = 0.0016

Hence, the solution is 0.0016

Answers

Answer:

6x^3-12x^2+3x-3

Step-by-step explanation:

Answer:

6x³ - 12x² + 3x - 3

Step-by-step explanation:

f(x) - g(x)

= (6x³ - 3x² + 4x - 4) - (9x² + x - 1)

= 6x³ - 3x² + 4x - 4 - 9x² - x + 1

= 6x³ - 3x² - 9x² + 4x - x - 4 + 1

= 6x³ - 12x² + 3x - 3

Find the radius of a circle with a diameter of 16

Answers

Answer: R = 8

Step-by-step explanation:

The Radius is R = 8. Give me Brainiest PLZZZ!!!

Answer:8 maybe?????

Step-by-step explanation:

A store purchased a plasma screen TV for $770 and marked it up 150%. During a sale, the store marked it down 20%. What was the discount price on the plasma screen TV?

Answers

Answer:

1540

Step-by-step explanation:

First find the new price after the markup

The markup is

770 * 150%

770 * 1.5

1155

Add this to the original price

770 + 1155

1925

Now find the discount

1925*20%

1925*.20

385

Subtract this amount from the 1925

1925-385

1540

The final price is 1540

Answer:

Solution given:

cost price [c.p] of TV =$770

MP=c.p+ 150% of c.p=$770+150/100×770=$1925

discount [D]=20%

now

discount amount=D% of MP=20/100×1925=$385 is your answer.

$385 was the discount price on the plasma screen TV.

Find the value for m
-10 + 59 = 5m = 7 + 3m

Answers

-10+59=5m=7+3m
-49= 5m=7+3m
5m=56+3m
2m=56
m=28

Help me pleaseeeeeee

Answers

Answer:

Step-by-step explanation:

Answer:

i think it is 56 if it is wut i think it is

Step-by-step explanation:

can i plz have some help

Answers

Answer:

18.84

Step-by-step explanation:

The formula for circumference is 2*pi*r

So,

2*3.14*3

which equals,

18.84

Jessie spent a total of 14.00 to purchase a gift and have it gift-wrapped and mailed. The cost for the postage was $2.25, and she knows the gift itself cost $9.50.

Answers

Answer:

she spent 11.75$ total

Step-by-step explanation:

9.50+2.25=11.75

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