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Unformatted text preview: 9 1Chapter NineEstimation and Confidence IntervalsEstimation and Confidence Intervals GOALSWhen you have completed this chapter, you will be able to:ONEDefine a what is meant by a point estimate.TWODefine the term level of level of confidence.THREEConstruct a confidence interval for the population mean when the population standard deviation is known.FOURConstruct a confidence interval for the population mean when the population standard deviation is unknown.Goals9 2Chapter Nine continuedEstimation and Confidence IntervalsEstimation and Confidence IntervalsGOALSWhen you have completed this chapter, you will be able to:FIVEConstruct a confidence interval for the population proportion. SIXDetermine the sample size for attribute and variable sampling.Goals9 3Point and Interval EstimatesA confidence intervalis a range of values within which the population parameter is expected to occur. The two confidence intervals that are used extensively are the 95% and the 99%.An Interval Estimatestates the range within which a population parameter probably lies.A point estimateis a single value (statistic) used to estimate a population value (parameter).9 4Factors that Factors that determine the determine the width of a width of a confidence confidence intervalintervalPoint and Interval EstimatesThe sample size, nThe variability in the population, usually estimated by sThe desired level of confidence9 5Interval EstimatesFor the 99% confidence interval, 99% of the sample means for a specified sample size will lie within 2.58 standard deviations of the hypothesized population mean.95% of the sample means for a specified sample size will lie within 1.96 standard deviations of the hypothesized population mean.For a 95% confidence interval about 95% of the similarly constructed intervals will contain the parameter being estimated.9 6Standard Error of the Sample Meansxn=xthe standard deviation of the population...
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This note was uploaded on 12/28/2011 for the course BA 210 taught by Professor Ms.deppen during the Fall '11 term at Montgomery College.
 Fall '11
 Ms.Deppen

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