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Guidelines for the Jolly Blue Giant Health Insurance Company say that the average hospitalization for a triple hernia operation should not exceed 30 hours. A diligent auditor studied records of 16 randomly chosen triple hernia operations at Hackmore Hospital and found a mean hospital stay of 40 hours with a standard deviation of 20 hours. "Aha!" she cried, "the average stay exceeds the guideline." The value of the test statistic for her hypothesis is:
a distribution is composed of the short-term memory scores of 79 people. the distribution has a mean of 56 and a
Tthe job is normally distributed and has a mean time of 30 minutes with a standard deviation of 8 minutes. How much time should the employer allow employees to finish the job?
computing probability values using normal distribution.in a population of test scores not known to be normally
She randomly samples 67 CFOs and finds that 40 of them get their money news from newspapers. Does the test show enough evidence to reject the findings of Robert Half International? Use a = .05.
in order to determine the summer unemployment rate among college students a pilot sample was taken and it was
At the .05 significance level, is there a difference in the proportion of viewers watching the three channels?
of the 89 people who answered yes to a question 8 were male. of the 43 people who answered no to the question 5 were
an article in the 1993 volume of the transactions of the american fisheries society reports the results of a study to
You are asked to estimate the chance that the sum will be positive.
A manufacturer of microwaves gathers information on microwave sales from a random sample of 50 stores in a large retail chain. In the sample, the mean number of microwaves sold per store last week was 19, with standard deviation 2.
all february data was combined of 28 days of dataall august data was combined of 31 days of dataaugust 2013mean
The English Department wants to know whether there is a difference in the proportions of female students taking Eng 110 and Eng 100 courses. Samples are collected from each class: Eng 110 sample found 16 out of 29 students in class and Eng 100 ..
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