Question: Given a recent out break of illness caused by F. co li bacteria, the mayor in a large city is concerned that some of his restaurant inspectors are not consistent with their evaluation s o f a restaurant's cleanliness. In order to investigate this possibility, the mayor has five restaurant inspectors grade (scale of 0 to 100) the cleanliness of three restaurants. The results are shown in the accompanying tab le and can also be found on the text website, labeled Restaurants.
![46_Reataurant.png](https://secure.tutorsglobe.com/CMSImages/46_Reataurant.png)
a. Use Excel to generate the ANOVA table.
b. At the 5 % significance level, can you conclude that average grades differ by restaurant?
c. If average grades differ by restaurant, use Tukey's HSD test a t the 5% significance level to determine which averages differ.
d. At the 5 % significance level, can you conclude that the average grades differ by inspector? Does the mayor have cause for concern?