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A random sample of 20 purchases showed the amounts in the table (in $). The mean is $50.13 and the standard deviation is $24.33. a)

A random sample of 20 purchases showed the amounts in the table (in $). The mean is

$50.13 and the standard deviation is $24.33.

a) How many degrees of freedom does the t-statistic have?

b) How many degrees of freedom would the t-statistic have if the sample size had been 5?

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