A survey of 25 randomly selected customers found the ages shown (in years). The mean is 32.48 years and the standard deviation is 10.10 years. 35 23 34 245 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? 37 35 43 25 11 46 41 UNWE 33 21 45 6 49 a) The t-statistic has degrees of freedom. (Simplify your answer.) b) If the sample size had been 225, the t-statistic would have degrees of freedom. Simplify your answer.)