Here null hypothesis is
Ho: t= 15
Against alternative hypothesis
Ha: t> 15
Where t is mean wait time at restaurant
Since sample size n=30 is quite large, we use z test
Test statistic is
Z = (tbar- t)/ (sigma/sqrt(n))
= (16.5-15)/ ( 2/sqrt(30))
= (1.5*5.477) / 2
= 4.1077
Critical value is one tailed z value at 95% confidence, which is 1.645. Since test statistic is greater than critical value, we reject Ho at 5% and conclude waiting time at restaurant is greater than 15 minutes.
Use an α = 0.05 significance level to test the claim that the mean wait time...
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