A Manufacturer Wants to Increase the Shelf Life of a Line

question 129

Multiple Choice

A manufacturer wants to increase the shelf life of a line of cake mixes. Past records indicate that the average shelf life of the mix is 216 days. After a revised mix has been developed, a sample of nine boxes of cake mix gave these shelf lives (in days) : 215, 217, 218, 219, 216, 217, 217, 218 and 218. At the 0.025 level, has the shelf life of the cake mix increased?

• A) Yes, because computed t is greater than the critical value.
• B) Yes, because computed t is less than the critical value.
• C) No, because computed t lies in the region of acceptance.
• D) No, because 217.24 is quite close to 216.

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Definitions:

Synovial Membrane

A specialized connective tissue that lines the inner surface of capsules of synovial joints and tendon sheath, responsible for producing synovial fluid for lubrication.

Joint

A point where two bones meet in the body, enabling movements and providing support.

Movement

The act or process of moving; changes in position or location.

Connection

The point at which two or more things are joined or the relationship between them.