1. A major company wants to estimate the number of working days lost because of employee absence from work. Using a sampling fraction of 1/25, a SRS sample S of size 2000 is drawn from the population of employees. For each employee in the sample yi, the number of days absent, is determined. Let S₁ and S₂ denote the subsamples of male and female employees, respectively. Some summary survey results are: Males: ns₁ 931 Σs, y = 12,604 1069 Σs y = 20, 412 Females: ns₂ = Σs, y = 232, 226 Σs y = 476, 208 (a) Estimate the mean number of days absent for all employees and com- pute a 95% confidence interval for this quantity. (b) Answer the questions in (a) for male employees. (c) Can you estimate the total number of days absent? Explain.

1. A major company wants to estimate the number of working days lost because of employee absence from work. Using a sampling fraction of 1/25, a SRS sample S of size 2000 is drawn from the population of employees. For each employee in the sample yi, the number of days absent, is determined. Let S₁ and S₂ denote the subsamples of male and female employees, respectively. Some summary survey results are: Males: ns₁ 931 Σs, y = 12,604 1069 Σs y = 20, 412 Females: ns₂ = Σs, y = 232, 226 Σs y = 476, 208 (a) Estimate the mean number of days absent for all employees and com- pute a 95% confidence interval for this quantity. (b) Answer the questions in (a) for male employees. (c) Can you estimate the total number of days absent? Explain.

College Algebra (MindTap Course List)

12th Edition

ISBN:9781305652231

Author:R. David Gustafson, Jeff Hughes

Publisher:R. David Gustafson, Jeff Hughes

Chapter8: Sequences, Series, And Probability

Section8.7: Probability

Problem 8E: List the sample space of each experiment. Picking a one-digit number

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