Test 40ps ppose a large labor union wishes to estimate the mean number ofhours p

Question

Test 40ps ppose a large labor union wishes to estimate the mean number ofhours per month a union memberis absentliem work The union decides to sample 39 af andam and monia me working time each month. the end of the month, the total number of hours absent tom workis recorded for each employee Which ofthe following should sed essimatehepaamelerof 'est A. Alange sample confidence interval forz B, Asmall sample confidence interval v for oc. Asmal sample confidence interval for O D. Alarge sample confidence interval for w

Explanation / Answer

The sample size is 339, and sample mean, and sample standard deviation can be obtained from the data recorded. Therefore, use large sample confidence interval for mu, population mean number of hours per month a union member is absent from work. The formula is as follows:

The c.i=Xbar+-Z(s/sqrt N-1), where, Xbar is sample mean, Z is Z critical at alpha/2 and s is sample standard deviation, and N is sample size.

Option D.

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