07 Jul ESTIMATE WITH 90% CONFIDENCE THE DIFFERENCE IN THE MEAN WEIGHT BETWEEN THE TWO GROUPS.
The following data represent weights (in pounds) for two random samples of men of approximately 5 fe Show more The following data represent weights (in pounds) for two random samples of men of approximately 5 feet 10 inches tall and of medium build. The only difference is that the first group is comprised of athletic persons and the second of non-athletic ones. Weights are assumed to follow normal distributions. Athletic men: 152 148 156 155 157 162 159 168 150 173. Non-athletic men: 155 157 169 170 171 161 181 165 183. C) At the 5% level of significance can we infer that the population mean weight of athletic men is lower than the population mean weight of non-athletic men by more than 2 pounds? D) Estimate with 90% confidence the difference in the mean weight between the two groups. E) After having compared the means of the weights of the two groups can we conclude at the 5% significance level that the variance of the weights of the non-athletic men is larger that the variance of the weights of the athletic men? Show less
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