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This study investigates the hours per month spent on the Internet by U.S. residents, age 18...

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Statistics

This study investigates the hours per month spent on theInternet by U.S. residents, age 18 to 24. The sample results are:n= 75, x-bar=28.5, and s=23.1 . We are to construct a 95%confidence interval based on this information.

a) What is critical value of t (that is, t*) for this confidenceinterval?

b) the standard error of the mean (SEM) is:

c) Rounded to one decimal place, as x-bar was, the margin oferror (MOE) for your confidence interval will be:

d) Which of the following conclusions is CORRECT?

We are 95% sure the mean hours spent per week on the Internet byU.S. residents, age 18 to 24, is between 23.5 and 34.1.

We are 95% sure the mean hours spent per month on the Internetby college students is between 23.2 and 33.8.

We are 95% sure the mean hours spent per month on the Internetby U.S. residents, age 18 to 24, is between 23.2 and 33.8.

We are 95% sure the mean hours spent per month on the Internetby U.S. residents, age 18 to 24, is between 23.5 and 34.1.

Answer & Explanation Solved by verified expert
4.4 Ratings (535 Votes)
Solution Given thatPoint estimate sample mean 285sample standard deviation s 231sample size n    See Answer
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