Instruction 8-3 A Quality Control Engineer Is Interested in the Mean Length

question 84

Short Answer

Instruction 8-3
A quality control engineer is interested in the mean length of timber poles being cut automatically by machine.The desired length of the insulation is 12 metres.It is known that the standard deviation in the cutting length is 0.15 metres.A sample of 70 cut poles yields a mean length of 12.14 metres.This sample will be used to obtain a 99% confidence interval for the mean length cut by machine.
-Referring to Instruction 8-3,suppose the engineer had decided to estimate the mean length to within 0.03 with 99% confidence.Then the sample size would be ________.

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Definitions:

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A service that allows customers to borrow a vehicle for a certain period of time in exchange for a fee.

Competitive Market

A market structure characterized by a large number of buyers and sellers, such that no single buyer or seller can influence the market price.

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A cereal plant that yields large kernels on a cob, used globally for food, feedstock, and biofuel production.

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A relationship between two variables in which an increase in the value of one variable is associated with a decrease in the value of the other variable. It is illustrated by a curve that slopes downward from left to right.