# Q: What method of testing in PHStat within Excel would I use for this statistical problem? A new production control assistant is hired by Wong's Cookie Factory. He has promised to increase production to a least 17,000 cookies a day. If he does not, he has promised to quit. After 90 days on the job, output has averaged 16,714.3 cookies, with a standard deviation of 8,012 cookies. At the 10 percent significance level, must he now resign as the new assistant in production control?

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Asked Dec 1, 2019
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Q: What method of testing in PHStat within Excel would I use for this statistical problem?

A new production control assistant is hired by Wong's Cookie Factory. He has promised to increase production to a least 17,000 cookies a day. If he does not, he has promised to quit. After 90 days on the job, output has averaged 16,714.3 cookies, with a standard deviation of 8,012 cookies. At the 10 percent significance level, must he now resign as the new assistant in production control?

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## Expert Answer

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Step 1

In this case, the population standard deviation is unknown.

Step 2

Therefore, appropriate test is on...

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