Question: 38 Assume that z is the test statistic and calculate the value of z? for each of the following:

a. H_o: μ = 51, σ = 4.5, n = 40,

= 49.6

b. H_o: μ = 20, σ = 4.3, n = 75,

= 21.2

c. H_o: μ = 138.5, σ = 3.7, n = 14,

= 142.93

d. H _o: μ = 815, σ = 43.3, n = 60,

= 799.6