A Manufacturer Wants to Increase the Shelf Life of a Line

question 55

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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