Stat 1124 - Confidence Intervals

# Stat 1124 - Confidence Intervals - STAT 1124 Statistical...

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STAT 1124 Statistical Methods – I Confidence Intervals – CH 14 Albert Wong, Ph.D. Langara College January 2009 Statistical Inference • Statistical Inference: Methods for drawing conclusions about a population from sample data • Two major Types of inference: ¾ Estimation: Point (statistic) and Interval estimation (confidence intervals) ¾ Hypothesis Testing

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Inference About the Population Mean – A Simple Case • We have a simple random sample (SRS) from the population of interest • The variable that we measure has a Normal distribution with mean μ and standard deviation σ . • We do not know about the population mean μ but we do know about the population standard deviation σ . • The above conditions are called the “simple conditions” in the text. They are the ideal conditions that we probably would not have in practice • We wish to use the sample to estimate μ. Estimating the Population Mean • We use the sample mean to estimate the population mean μ • We do not expect that the sample mean to be exactly equal to μ. • Note that the sampling distribution of the sample mean is N(μ,
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## This note was uploaded on 07/14/2010 for the course STATS 1124 taught by Professor Michael during the Summer '09 term at Langara.

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Stat 1124 - Confidence Intervals - STAT 1124 Statistical...

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