For each of the following problems, use the Traditional Method presented in class and outlined on the left of page 334 of Triola and Triola. You do not need to compute the \(P\)-values for these problems. Use the \(T\)-statistic from page 354 of Triola and Triola and the critical values given in Table A-3 in the Appendix of Triola and Triola.
9, 10, 12