Question

. In order to compare the life expectancies of three different brands of printers, four printers...

. In order to compare the life expectancies of three different brands of printers, four printers (sample size) of each brand were randomly selected. Information regarding the three brands is shown below. (60 points)

Brand A

Brand B

Brand C

Sample mean:
Average life (in months)

62

50

58

Sample variance

36

25

32

a) State the null and alternative hypotheses to be tested. (10 points)

b) Complete ANOVA table below. The null hypothesis is to be tested at 95% confidence. You need to show the entire calculation process to get full credits. What do you conclude? (50 points)

SSTR =

MSTR =

SSE =

MSE =

F =

Critical value of F =

Summarize the final answers below.

Source of Variation

SS

df

MS

F

F critical value

Between Treatment

  

                 

                 

Within Treatment

              

Total

                 

              
Math   Statistics-And-Probability   
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