8.77 The new worker absence study
Refer to the previous exercise. Suppose you would like to do a new study next year to see if there has been a change in the percent of companies that do not measure how worker absences affect their company's bottom line. Assume that a new sample of 1234 companies will be used for the new study.
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(a) (i) 0.0379. (ii) 0.0383. (iii) 0.0386. (iv) 0.0387. (c) As the second proportion increases (moves closer to 0.5), the margin of error of the difference in proportions increases somewhat, but note the change is not drastic due to the large sample size.