9.43 The relation between the z distribution and the t distributions: For the hypothesis tests described in parts

(a) through (c), identify what the critical z value would have been if there had been just one sample and we knew the mean and standard deviation of the population:

a. A single-sample t test examining scores for 26 participants to see if there is any difference compared to the population, using an alpha level of 0.05

b. A one-tailed, single-sample t test performed on scores on the Marital Satisfaction Inventory for 18 people who went through marriage counseling, using an alpha level of 0.01

c. A two-tailed, single-sample t test, using an alpha level of 0.05, with 34 degrees of freedom