Astudy was conducted in order to estimate μ, the mean number of weekly hours that u.s. 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 σ = 3.6 hours. a similar study conducted a year earlier estimated that μ, the mean number of weekly hours that u.s. adults use computers at home, was 8 hours. we would like to test (at the usual significance level of 5%) 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:
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Ответ:
Our conclusion is that the mean number of weekly hours that U.S. adults use computers at home is 8 hours
Explanation:
8 hours falls in the 95% confidence Interval (7.7, 9.3), so we can conclude that the mean weekly hours that U.S. adults use computers at home is 8 hours
Ответ:
option d
Explanation:
this is not right, so I'm just guessing