You want to have 95% confidence of estimating the proportion of office
workers who respond to e-mail within an hour to within ± 0.05. Because you
have not previously undertaken such a study, there is no information available
from past data. Determine the sample size needed? (10%)
Microsoft Excel was used on a set of data involving the number of parasites
found on 46 Monarch butterflies captured in Pismo Beach State Park. A
biologist wants to know if the mean number of parasites per butterfly is over 20.
She will make her decision using a test with a level of significance of 0.10. The
following information was extracted from the Microsoft Excel output for the
sample of 46 Monarch butterflies:
What is the power of the test if the mean number of parasites per butterfly on
Monarch butterflies in Pismo Beach State Park is 18 using a 5% level of
significance and assuming that the population standard deviation is 25.92.
(10%)
At a computer manufacturing company, the actual size of computer chips is
normally distributed with a mean of 1 centimeter and a standard deviation of
0.1 centimeter. A random sample of 12 computer chips is taken. Above what
value do 2.5% of the sample means fall? (10%)
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