A Company Claims That the Standard Deviation in Their Delivery

question 30

Essay

A company claims that the standard deviation in their delivery time is less than 5 days. A sample of 27 past customers is taken. The average delivery time in the sample was 14 days with a standard deviation of 4.5 days. At 95% confidence, test the company's claim. Use the critical value approach.

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Definitions:

Ebbinghaus

A psychologist best known for his research on memory and the forgetting curve, which describes how information is lost over time when there is no attempt to retain it.

Nonsense Syllables

Strings of letters that do not follow grammatical rules and have no meaning, used in psychological experiments to study memory and learning.

Methodology

The system of methods followed in a particular discipline or field of study.

Forgetting

The inability to bring to mind information that was previously remembered.