a) What is an appropriate null hypotheses? b) What is an appropriate alternative hypothesis? c) What is the sample's test statistic?

A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
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A certain manufactured protein bar is supposed to contain 21% protein by weight. A sample of 15 specimens of this product had an average percentage of 21.5 with a standard deviation of  0.96  (0.0096 in decimal form).   If the mean percentage is found to differ from 21, the manufacturing process will be recalibrated.

a) What is an appropriate null hypotheses?

b) What is an appropriate alternative hypothesis?

c) What is the sample's test statistic?

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