Newly purchased tires of a particular type are supposed to be filled to a pressure of 30 psi. let μ denote the true average pressure. a test is to be carried out to decide whether μ differs from the target value. determine the p-value for each of the following z test statistic values. (round your answers to four decimal places.) (a) 2.13 (b) −1.78 (c) −0.52 (d) 1.42