a b) sales on Y axis comtype on the x axis. This will give you a good idea of wh

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a
b) sales on Y axis comtype on the x axis. This will give you a good idea of whether different categories of comtype appear to differ in sales. In the scatterplot, you should see that sales in the middle categories 3 - 6 are in similar ranges on the vertical axis, but 1 and 2 have somewhat higher sales, and category 7 appears to have somewhat lower sales. This implies that, when you create dummy variables for comtype, dummy variables for categories 1, 2, 7 are likely to be statistically significant in the multiple regression model

Explanation / Answer

First of all where is the question? and categories 1,2 and 7 are likely to be statistically significant if One Way ANOVA (Completely randomized design) is performed instead of regression.

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