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Confidence Intervals for Means

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Confidence Intervals for Means. q uantitative data. means standard deviation. small ME. t. d f n-1. Normal model. fatter. increase. Independence assumption Random Sample Less than 10% of population Nearly normal (check with histogram). - PowerPoint PPT Presentation

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Page 1: Confidence Intervals for Means

Confidence Intervals for Means

Page 2: Confidence Intervals for Means

quantitative datameans standard deviation

small ME

Page 3: Confidence Intervals for Means

t

df n-1

Normal model

fatter

increase

Page 4: Confidence Intervals for Means

1.Independence assumption2.Random Sample3.Less than 10% of population4.Nearly normal (check with histogram)

invT(probability, df)

Page 5: Confidence Intervals for Means

ervaltsample

MetPerformConditions

int1

:

04.31y

717.1)22,95(.* invTt

23

24776.4717.104.31

)56.32,52.29(

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ClassworkPg. 556-557 (20, 31, 32)

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