An experiment was conducted to determine which of three advertisements to use in introducing a new personal computer. A total of 120 people who were thinking of buying a personal computer was split randomly into three groups of 40 each. Each group was shown a different advertisement and each person was asked his or her likelihood of buying the advertised brand. A scale of 1 (very unlikely) to 7 (very likely) was used. The results showed that the average likelihood of purchase was
Advertisement A: 5.5
Advertisement B: 5.8
Advertisement C: 5.2
The ANOVA table was as follows:

a. What is the appropriate null hypothesis? The alternative hypothesis?
b. What is the F-ratio? The p-value?
c. Is the result significant at the .10 level? The .05 level? The .01 level?
d. Are there any differences among the impacts of the three advertisements?

Transcribed Image Text:

Source of Variation Due to advertisements Unexplained Total df MSS 6.0 2.0 F-Ratio p-Value 12 234 246 2 119