Question

**Average hours per week listening to the radio.**
The *Student Monitor* surveys 1200 undergraduates from
four-year colleges and universities throughout the United States
semiannually to understand trends among college
students.**12** Recently, the *Student Monitor*
reported that the average amount of time listening to the radio per
week was 11.5 hours. Of the 1200 students surveyed, 83% said that
they listened to the radio, so this collection of listening times
has around 204 (17% × 1200) zeros. Assume that the standard
deviation is 8.3 hours.

(a) Give a 95% confidence interval for the mean time spent per week listening to the radio.

(b) Is it true that 95% of the 1200 students reported weekly times that lie in the interval you found in part (a)? Explain your answer.

(c) It appears that the population distribution has many zeros and is skewed to the right. Explain why the confidence interval based on the Normal distribution should nevertheless be a good approximation.

**Average hours per week listening to the radio.**
The *Student Monitor* surveys 1200 undergraduates from
four-year colleges and universities throughout the United States
semiannually to understand trends among college
students.**12** Recently, the *Student Monitor*
reported that the average amount of time listening to the radio per
week was 11.5 hours. Of the 1200 students surveyed, 83% said that
they listened to the radio, so this collection of listening times
has around 204 (17% × 1200) zeros. Assume that the standard
deviation is 8.3 hours.

(a) Give a 95% confidence interval for the mean time spent per week listening to the radio.

(b) Is it true that 95% of the 1200 students reported weekly times that lie in the interval you found in part (a)? Explain your answer.

(c) It appears that the population distribution has many zeros and is skewed to the right. Explain why the confidence interval based on the Normal distribution should nevertheless be a good approximation.

Answer #1

Question 31
The Student Monitor surveyed 405 undergraduates from 100
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hours.
A.) Calculate the 95% confidence interval for the mean time
spent per week on the Internet. Show your work or no credit. Just
show values plugged into formula, then the final boundary
values.
B.) Suppose the...

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