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A study was conducted to determine the mean number of weekly hours that adults in the US use computers at home. A random sample of 81 adults gives a mean weekly computer usage time of 8.5 hours. Based on prior studies, the population standard deviation is assumed to be 3.6 hours.
Which will provide the narrowest confidence interval? And Why?
a) using 2 samples of 200 each
b) using a sample size of 400
c) using a different sample of size 81
d) using a sample of size 36
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from 8 names on a ballot a committee of will be elected to attend a political national convention. how many different
robert stands three times on a pair of scales in a period of 5 minutes. the first time he weighs 92kg the second time
You are trying to determine the statistical significance of an equation. Given the following information, test the slope of the equation at the 95% level of confidence.
Describe what assumptions must be met to use this test. Finally, where in your course project data set might you employ a paired t-Test?
Find out the probability that the return for common stocks will be more than 0%.
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