Samples of two types of electric light bulbs were tested for the length of life and following data were obtained Type I 8 Type II 7 Sample size Sample mean 1234 1036 36 40 Sample Standard Dev Is the difference in the means sufficient to warrant that type I superior to type II regarding length of life. a. 3.99: reject the null hypothesis b. 9.33: reject the null hypothesis c. 9.39: reject the null hypothesis d. 3.90: reject the null hypothesis

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