Question 1 of 7 Points: 10 A study was conducted in order to estimate ? the mean

Question

Question 1 of 7 Points: 10 A study was conducted in order to estimate ? the mean number of weekly hours that US adults use computers at home. Suppose a random sample of 81 U.S. adults gives a mean weekly computer usage time of 8.5 hours and that from prior studies, the population standard deviation is assumed to be ?-3.6 hours. A similar study conducted a year earlier estimated that ? the mean number of weekly hours that US adults use computers at home. was 8 hours. We would like to test (at the usual significance level of 50%) whether the current study provides significant evidence that this mean has changed since the previous year. Using a 95% confidence interval of (7.7, 9.3), our conclusion is that: the current study does provide significant evidence that the mean number of weekly hours has changed over the past year, since 8 fa the confidence interval. outside the current study does not provide significant evidence that the mean number of weekly hours has changed over the past year, since 8 falls outside the confidence interval. the current study does provide significant evidence that the mean number of weekly hours has changed over the past year, since 8 falls inside th confidence interval. 0 the current study does not provide significant evidence that the mean number of weekly hours has changed over the past year, since 8 falls inside the confidence interval. o None of the above. The only way to reach a conclusion is by finding the p-value of the test

Explanation / Answer

Hi,

The answer is D

(d) the current study does not provide significant evidence that the mean number of weekly hours has changed over the past year, since 8 falls inside the confidence interval.

Thanks

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