took a mean of 26 weeks for them to find another position. The standard deviation of the
sample was 6.2 weeks. Construct a 95 percent confidence interval for the population mean.
Is it reasonable that the population mean is 28 weeks ? Justisfy your answer.
38 The Human Relations Department of Electronics Inc. would like to include a dental plan
as part of the benefits package. The question is: How much does a typical employee and his or her
family spend per year on dental expenses ? A sample of 45 employees
reveals the mean amount spent last year was $ 1,820, with a standard deviation of $ 660.
a. Construct a 95 percent confidence interval for the population mean.
b. The information from part (a) was given to the president of Electronics Inc. He indicated he
could afford $ 1,700 of dental expenses per employee. Is it possible that the population mean could
be $ 1,700 ? Justify your answer.
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