Step 1 :A survey of 25 randomly selected customers found the ages shown (in years). The mean is 32.88 years and the standard deviation is 9.27 years.
Step 2 :The degrees of freedom for a t-statistic is calculated as the sample size minus 1. In this case, the sample size is 25, so the degrees of freedom would be 25 - 1 = 24.
Step 3 :Final Answer: The t-statistic has \(\boxed{24}\) degrees of freedom.