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A survey of 25 randomly selected customers found the ages shown​ (in years). The mean is 33.12 years and the standard deviation is 9.69 years.
​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 225​?

Remember that degrees of freedom for t-test is n - 1, 

with n = 25,   degrees of freedom = 25  - 1 = 24

If the sampe size  = 225, then the degrees of freedom  = 225 -1 = 224. 

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