A chemist is interested in comparing four different catalysts by measuring reaction times.Each catalyst is tested five times,with each experiment randomly assigned one of the four catalysts.How many degrees of freedom does the treatment sum of squares have? How about the error sum of squares?
A)df-treatment = 4; df-error = 16
B)df-treatment = 3; df-error = 16
C)df-treatment = 4; df-error = 19
D)df-treatment = 3; df-error = 19
E)df-treatment = 3; df-error = 17

Question

Quizplus · Accepted Answer

The degrees of freedom for treatment is the number of groups minus one (4-1=3). The degrees of freedom for error is the total number of observations minus the number of groups (20-4=16).

A Chemist Is Interested in Comparing Four Different Catalysts by Measuring