Question

Water samples were taken at three different locations in a river to determine whether the quantity of dissolved oxygen, a measure of water polution, varied from one location to another. The results are given in the table below.

1	2	3
5.6	6.1	3.8
6.3	6.7	3.5
5.2	6.5	3.9
5.8	6.3

If we were to use ANOVA to analyze this data, and wanted to construct a normal probability plot of the residuals, what would be the numerical values (in order) of the first two numbers that would go on the x-axis?

Separate your answers with a comma.

Answer 1

1 2 3
5.6   6.1   3.8
5.2   6.5   3.9
5.8   6.3  

the normal probability plot of residuals is given by,

here, minitab is used for plotting the points. (stat--anova--one way)

-0.33,-0.2 are the first two numbers that will go to the x axis.