Author Question: A 95 confidence interval for the difference in the population proportions of men (group 1) and women ... (Read 144 times)

amal

  • Hero Member
  • *****
  • Posts: 572
A 95 confidence interval for the difference in the population proportions of men (group 1) and women (group 2) who exercise regularly, is -0.06 to +0.10. Which of the following is not a reasonable conclusion from this confidence interval?
 a. It is plausible that men spend 10 more time exercising, on average, than do women.
  b. It is plausible that equal proportions of men and women exercise regularly.
  c. It is plausible that the difference in proportions of men and women who exercise regularly is at least 0.05.
  d. It is not plausible that the difference in proportions of men and women who exercise regularly is at least 0.15.

Question 2

At a small college somewhere on the East coast, 20 of the girls and 30 of the boys smoke at least once a week. Independent random samples of 75 girls and 100 boys are to be selected and the proportions of smokers in the samples are to be calculated. What is the standard deviation of the sampling distribution of the difference in the sample proportion of girl smokers and the sample proportion of boy smokers?



Jossy

  • Sr. Member
  • ****
  • Posts: 336
Answer to Question 1

A

Answer to Question 2

0.0651



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
 

Did you know?

Hip fractures are the most serious consequences of osteoporosis. The incidence of hip fractures increases with each decade among patients in their 60s to patients in their 90s for both women and men of all populations. Men and women older than 80 years of age show the highest incidence of hip fractures.

Did you know?

Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.

Did you know?

It is important to read food labels and choose foods with low cholesterol and saturated trans fat. You should limit saturated fat to no higher than 6% of daily calories.

Did you know?

It is widely believed that giving a daily oral dose of aspirin to heart attack patients improves their chances of survival because the aspirin blocks the formation of new blood clots.

Did you know?

The oldest recorded age was 122. Madame Jeanne Calment was born in France in 1875 and died in 1997. She was a vegetarian and loved olive oil, port wine, and chocolate.

For a complete list of videos, visit our video library