Question 1175856
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Hi
Previous 3 seasons:   μ = 75 and   σ = 7  
Sample:  n = 100 and   x̄ = 78 (out of 100) 
Ho:   μ = 75  
Ha    μ > 75 
1)Level of significance is .04
2) One-tailed, critical value = invNorm(.96) =  1.7507
3) Sample > 30, population σ known: use z-test
4) {{{z =blue (x - mu)/blue(sigma/sqrt(n))}}}
      z = 3/(7/10) = 4.2857
    z > critical value Reject Ho.  
Evidence shows an increase in mean ratings this season.

Wish You the Best in your Studies.
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