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

question 161

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,the confidence interval goes from ________ to_________ .

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Definitions:

High-Low Method

is a technique used in managerial accounting to estimate variable and fixed costs based on the highest and lowest levels of activity.

Variable Cost Per Unit

This is the cost that varies with each unit produced, including materials, labor, and other direct costs.

Total Fixed Costs

The sum of all costs that do not change with the level of output or activity within a certain period.

Cost-Volume-Profit Analysis

The examination of the relationships among selling prices, sales and production volume, costs, expenses, and profits.