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

question 88

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 critical value to use in obtaining the confidence interval is ________.

---

Definitions:

Retail Hardware Store

A business venue that sells tools, building supplies, and equipment directly to consumers for home improvement and repair projects.

Chargeout Rates

The rates that a company charges for its services, often used in professional services industries to bill clients.

Profit Margin

A financial metric used to evaluate the profitability of a business, calculated as net income divided by revenue.

Mass Service

A type of service delivery designed to manage and serve large numbers of customers efficiently, often seen in sectors like banking and fast food.