14. 0/1 points | Previous Answers My Notes In order to better understand a parti

Question

14. 0/1 points | Previous Answers My Notes In order to better understand a particular metal stamping process, a manufacturer wishes to estimate the mean length of items produced by the process during the past 24 hours. How many parts should be sampled in order to estimate the population mean to ±0.15 millimeter (mm) with 96% confidence? Previous studies of this machine have indicated that the standard deviation of lengths produced by the stamping operation is about 2mm. (Use 3 decimal places critical value z* which you can find it from Table near the bottom of the table.) n750.03X

Explanation / Answer

Margin of error, ME = 0.15

For 96% CI, z = 2.054

sigma = 2

ME = z * sigma / sqrt(n)

n = (z*sigma/ME)^2

n = (2.054 * 2 / 0.15)^2

n = 750.03

n = 750

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