At a local university, a sample of 25 evening students was selected in order to determine whether the average age of the evening students is significantly different from 21. the average age of the students in the sample was 23 with a standard deviation of 3.5. the population standard deviation is unknown (hint: use t-test with n-1 df). let a= 0.05
formulate the hypotheses for this problem.\
compute the test statistic.
determine the p-value and test these hypotheses.
compute the critical values and indicate them on t-distribution curve.