Lecture 8 Part I.pdf


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Confidence Intervals

Sample Size

• Assumptions


Population Standard Deviation Is Known



Population Is Normally Distributed



If Not Normal, use large samples

Too Big:
• Requires too
much resources

Too Small:
• Won’t do
the job

• Confidence Interval Estimate

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Factors Affecting
Interval Width
• Data Variation (measured by
standard deviation)

• Level of Confidence
(1 - α)%

© 1984-1994 T/Maker Co.

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