b. Perform a two-sided test at the 5% significance level and describe the result. (use the first method shown in class, that is, compute the value oftstat and compare it to the appropriate value from the t table). test statistic = x bar - w/ s*sqrt(@) = 38.1 - 43.1/ 16.2*sqrt(50) = -2.18 t critical value at 5% = -1.96 We reject HO since test statistic is greater than t critical value. Conclusion: There is a statistically significant difference between the mean age of the customers and the age of the general population