题目为 A study was conducted in a large city following the dramatic increase in coffee price during the final quarter of 2003. The objective was to compare the mean supermarket prices of the "four" leading brands at the end of the year. "Eight" supermarkets in the city were selected, and the price per pound was recorded for each brand. The mean square of prices for brands was .05 and that for supermarkets was .03. The total sum of squares of prices was .45. A. Are the average prices of coffee the same for the eight supermarket? Use α = .05 B. Are the average prices of coffee the same for the four brands? Use α = .05 C. Find a 90% confidence intervals for the difference in the mean price of Brand A and Brand B if he sample mean price of Brand A was $2.43 and that of Brand B was $2.49. D. List the assumption required for the above tests. ==================================================== A和B是用ANOVA表去算出F值 F(brands)=11.628 F(supermarkets)=6.977 然後用H0和H1去做有没有全等的检定 算出A B 皆在拒绝域 AcH1 --- C.2.43-2.49 +/- t 0.95(21)√(0.0043/4 + 0.0043/4) D.常态性 同质性 独立性 --- C的区间估计不太确定 请问大家这样步骤有没有问题 感谢 --

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