Independent samples of 400 observations are selected from two populations. Sample 1 Sample 2 mean= 5275 mean= 5240 standard deviation= 150 standard deviation= 200 a) Use a 90% confidence interval to estimate (µ1-µ2) b) Test the null hypothesis µ1-µ2= 25 against the alternative hypothesis µ1-µ2? 25 at the significance level a= .05
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