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In an effort to promote a new product, a marketing firm asks participants to rate the...

In an effort to promote a new product, a marketing firm asks participants to rate the effectiveness of ads that varied by length (short, long) and by type of technology (static, dynamic, interactive). Higher ratings indicated greater effectiveness.

Source of Variation SS df MS F
Length 5         
Technology            
Length × Technology 142         
Error 570 114      
Total 847         

(a) Complete the F-table and make a decision to retain or reject the null hypothesis for each hypothesis test. (Assume experimentwise alpha equal to 0.05.)

Source of
Variation
SS df MS F
Length 5
Technology
Length ×
Technology
142
Error 570 114   
Total 847      


State the decision for the main effect of length.

Retain the null hypothesis.Reject the null hypothesis.     


State the decision for the main effect of technology.

Retain the null hypothesis.Reject the null hypothesis.     


State the decision for the interaction effect.

Retain the null hypothesis.Reject the null hypothesis.     


(b) Based on the results you obtained, what is the next step?

No further analysis is needed, because none of the effects are significant.Compute pairwise comparisons for the technology factor.      Compute simple main effect tests for the significant interaction.Compute pairwise comparisons for the length factor.

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