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Social Science Clinic => Business => Management => Topic started by: WWatsford on Dec 3, 2019

Title: What is the required sample size to be 95% confident that the observed average time is within 2% of ...
Post by: WWatsford on Dec 3, 2019

Question 1

A manufacturing plant assembly line job has a standard time of 5 minutes. A worker with a performance rating of 87% is assigned the task and given an allowance factor of 13%. What is the worker's average observed time?

Question 2

What is the required sample size to be 95% confident that the observed average time is within 2% of the actual value if the process has a standard deviation of 1 minute and mean of 50 minutes?

Title: What is the required sample size to be 95% confident that the observed average time is within 2% of ...
Post by: taylorsonier on Dec 3, 2019

Answer 1

Normal time = Standard time (1 - AF) = .87(5) minutes
Average observed time = Normal time/ PF = (.87(5))/.87 = 5 minutes

Answer 2

N = (zs/hx)^2 = (1.96∗1/.02/50)^2 = 3.8416 = 4 samples