Suppose a large labor union wishes to estimate the mean number of hours per mont

Question

Suppose a large labor union wishes to estimate the mean number of hours per month a union member is absent from work. The union decides to sample 339 of its members at random and monitor the working time of each of them for 1 month. At the end of the month, the total number of hours absent from work is recorded for each employee. Which of the following should be used to estimate the parameter of interest for this problem?

A. A small sample confidence interval for

B. A large sample confidence interval for

C. A large sample confidence interval for z

D. A small sample confidence interval for t

Explanation / Answer

See here Answer is B)

B) A large sample confidence interval for

because a here sample is size > 30 so it is large . and we compute confidence inerval for mean thats wahy option B) is correct .

Other options )

A) A small sample confidence interval for

this option is incorrect because here sample size is lare not smalle it >30 so it is large not small(<30)

C) A large sample confidence interval for z

this option is incorrect because we compute confidence interval for mean() not Z

D. A small sample confidence interval for t

this option is incorrect because and sample size is large not samll and we compute confidence interval for mean() not t

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