Question 1175860
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Hi
Population:   μ = 40
Sample:  n = 28 and   x̄ = 42  and s = 2.1
Ho:   μ =  40
Ha    μ ≠   40
1)Level of significance is .05
2) Two-tailed
3) Sample 28, population σ Unknown: use t-test
4)  critical value- df27 :  t = 2.05
4) {{{t =blue (x - mu)/blue(s/sqrt(n))}}}
      t= 2/(2.1/√28) = 5.04
    t value > critical value 
Reject Ho.  
Evidence shows that the mean number of calls 
per salesperson per week is different from 40.

Wish You the Best in your Studies.
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