Last Year, During an Investigation of the Time Spent Reading

question 131

Short Answer

Last year, during an investigation of the time spent reading emails on a daily basis, researchers found that on Monday the average time was 50 minutes. Office workers claim that with the increased spam and junk mail, this time has now increased. To conduct a test, a sample of 25 employees is selected, with the following results: sample mean = 51.05 minutes and sample standard deviation = 14.2 minutes. What is the critical value for α = .05 to test the hypotheses and apply the critical value rule to determine if the null hypothesis can be rejected.

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Definitions:

Statistical Process Control

A methodology applied to monitor and control a process to ensure that it operates at its fullest potential, using statistical techniques.

Process Capability Index

A statistical measure of a process's ability to produce output within specified limits.

Specification Weight

A measure that indicates the importance or priority of a particular specification parameter in a product or process.