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Slides for Recitation VII

# Slides for Recitation VII - STAT 201 STAT Recitation VII...

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STAT 201 STAT 201 Recitation VII (05/15/09)

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z-test? t-test? For a mean is known is unknown Large sample test for a proportion Hypothesis Testing Hypothesis Testing n q p p p z 0 0 0 - = n X z σ μ 0 - = n s X t 0 - = Rejection region H 1 is “>” Upper-tail z> z ; t>t , d.f=n-1 H 1 is “<” Lower-tail z<-z ; t<-t , d.f=n-1 H 1 is “ ” Two-side z> z /2 z<- z /2 ; t>t ¸ /2, d.f=n-1 &
Q1 Q1 Historically, the mean score on an achievement test for students at PS 289 has been 640 points. A group of faculty at the school have created an online review course for the students, which is of course intended to improve the mean test score. A random sample of 40 students goes through the online review course and then takes the achievement test. The resulting sample yields a mean score of 648.2 with a standard deviation of 22.4. Does this result provide evidence that the population mean for students who take the review course is higher than the historical value of 640?

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Slides for Recitation VII - STAT 201 STAT Recitation VII...

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