Multiple Choice
In a manufacturing process,we are interested in measuring the average length of a certain type of bolt.Based on a preliminary sample of 9 bolts,the sample standard deviation is 0.3cm.If the lengths are normally distributed,how many bolts should be sampled in order to make us 95% confident that the sample mean bolt length is within 0.02cm of the true mean bolt length?
A) 864.36
B) 80
C) 1470
D) 3989
E) 1197
Correct Answer:
Verified
Correct Answer:
Verified
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