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An orthodontist claims that their average cost for teeth straightening with metal braces is less than...

An orthodontist claims that their average cost for teeth straightening with metal braces is less than the state average of $5400. To test this claim the orthodontist randomly selects 18 patients and found that mean cost was $5250 with a standard deviation of $629 Compute the p-value and round to 3 significant decimal places..

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Answer #1

Given: n=18 7=5250; s= 629 To test Ho: M = 5400 vs HI d < 5400 Test statistic, X - у sin 5250-5400 629 / 18 - 150 148.26 t -1

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