11.2 Test 1 Computer Practice

11.2 Test 1 Computer Practice - downtown other 2 3.5 5 4...

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Unformatted text preview: downtown other 2 3.5 5 4 3.5 6 4.5 5 2.5 5 4 4 3 5.5 4 3 4.5 2.5 4 3 2 6.5 4 5.5 3.5 3 5 4 2 6.5 7 3.5 4 2.5 2 4 5 6.5 1.152573529 2.5404762 NOT EQUAL VARIANCES! A bank is concerned about the time it takes customers to be served during lunch. It loo branches (one downtown and one not) and takes random samples from each branch to (in mins) a customer is in the bank during the lunch hour. Construct a 93% confidence in the average service times during lunch between the downtown branch and the othe Interpret your answer. Two-­‐Sample T-­‐Test and CI: downtown, other Two-­‐sample T for downtown vs other N Mean StDev SE Mean downtown 17 4.06 1.07 0.26 other 21 4.10 1.59 0.35 Difference = mu (downtown) -­‐ mu (other) Estimate for difference: -­‐0.036 93% CI for difference: (-­‐0.849, 0.776) T-­‐Test of difference = 0 (vs not =): T-­‐Value = -­‐0.08 P-­‐Value = 0.934 DF = 34 e served during lunch. It looks at its two samples from each branch to record the amount a time Construct a 93% confidence interval for the difference wntown branch and the other branch . = 0.934 DF = 34 We are 93% confident in the method used the adifference in the avg service times during lunch between the downtown branch and the other branch falls between -­‐0.849 and 0.776 minutes. ...
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