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A study is performed in a large southern town to determine whether the average amount spent...

A study is performed in a large southern town to determine whether the average amount spent on food per family in the town is significantly different from the national average. A random sample of the weekly grocery bills of 100 families in this town had a mean of $155.33 and a standard deviation of $23.94. Assume the national average amount spent on food for a four-person family is $150. What are the degrees of freedom of the test statistic?

A 2.226

B 2.394

C 99

D 0.028

math   Statistics-And-Probability   
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