a. Four random samples of 50 people each were asked to rate four different computer printers in terms of their ease of use. The responses are:

Very easy to use

Easy to use

Difficult to use

Very difficult to use

The responses were coded using a 4-3-2-1 system.

Do these data yield enough evidence at the 5% significance level to infer that differences in ratings exist among the four printers?

b. The responses were recoded using a 25-22-5-2 system. Do these data yield enough evidence to infer that differences in ratings exist between the four printers?

c. Why are the results of Parts (a) and (b) identical?