Question

Gillette claims that their double-edge shaver is better than the leading brand of single-edge shavers (Lady...

Gillette claims that their double-edge shaver is better than the leading brand of single-edge shavers (Lady Bic). In a recent study, 26 women rated the Gillette and the Lady Bic shavers on smoothness, closeness and safety. One group of women were used and each woman recorded two scores. The mean difference of those scores were tested with the following results.

Critical Value…………… t = 1.645 Test statistic ..................... t = 1.978 P-value.............................. = . 031 Significance level ……........... = .05

Have you proven that one razor is better that the other?

                a) no                                  b) yes                      c) not enough info    d) depends on p-value

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