Mathematics, 20.08.2020 02:01, reilly90
The CEO of a large corporation asks his Human Resource (HR) director to study absenteeism among its executive-level managers at its head office during the year. A random sample of 30 executive level managers reveals the following: Absenteeism: Sample mean = 7.3 days, Sample standard deviation=6.2 days 18 mid-level managers out of the 30 randomly selected mid-level managers, cite stress as a cause of absence. (a) Construct a 90% confidence intervalestimate for the mean number of absences for mid- level managers during the year.(b) Construct a 98% confidence intervalestimate for the population proportion of mid-level managers who cite stress as a cause of absence. (c) What sample size is needed to have 95% confidence in estimating the population mean absenteeism to within 1.5 days if the population standard deviation is estimated to be 8 days? (d) How many mid-level managers need to be selected to have 99% confidence in estimating population proportion of mid-level managers who cite stress as a cause of absence to within +0.075 if no previous estimate is available?
Answers: 2
Mathematics, 22.06.2019 01:00, imamnaab5710
3questions show how you solved the problem 1. subtract & simplify (โy2 โ 4y โ 8) โ (โ4y2 โ 6y + 3) 2.multiply and simplify 2x2y3z2 ยท 4xy4x2 3.multiply and simplify (x โ 4) (x2 โ 5x โ 6)
Answers: 1
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