A researcher asked participants to rate the quality of two well-known brands of paper bags-Prime and Zenith. Prime was rated higher than Zenith, and their mean ratings were 5.50 and 3.25 respectively. This difference was statistically significant at the .05 probability level. The research hypothesis for this study suggests that
A. Prime is better than Zenith in terms of quality.
B. Zenith is better than Prime in terms of quality.
C. There is no difference between Prime and Zenith in terms of quality.
D. There is a difference between Prime and Zenith in terms of quality.
Answer: D
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