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

1. H _o : μ = 51, σ = 4.5, n = 40,
   
   = 49.6
2. H _o : μ = 20, σ = 4.3, n = 75,
   
   = 21.2
3. H _o : μ = 138.5, σ = 3.7, n = 14,
   
   = 142.93
4. H _o : μ = 815, σ = 43.3, n = 60,

= 799.6

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