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A random sample of rehabilitation centers found the following information concerning length of stay for patients...

A random sample of rehabilitation centers found the following information concerning length of stay for patients (in days):

2.8       4.5       3.9       6.6       4.1       6.8

7.3       5.5       7.3       5.8       7.0       3.7

a. Find the mean and standard deviation for this sample.

b. Find a 99% confidence interval for the population average µ, assuming the population standard deviation to be 0.82.

Math   Statistics-And-Probability   
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