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AP Stats 9

# AP Stats 9 - AP Stats Chapter9 9.1 Sampling Distributions...

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AP Stats Chapter9 AP Stats Chapter9 9.1 Sampling Distributions 9.1 Sampling Distributions

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Sampling Distribution:

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Example 1

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Chapter – 9 Sampling Distributions 9.1 Sampling Distribution 9.1 Making Ball Bearings : A carload lot of ball bearings has mean diameter 2.5003 centimeters (cm). This is within the specifications for acceptance of the lot by the purchaser. By chance, an inspector chooses 100 bearings from the lot that have mean diameter 2.5009 cm. Because this is outside the specified limits, the lot is mistakenly rejected. (a) State whether each underlined number is a parameter or a statistic (b) Use appropriate notation to describe each underlined number

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9-1 2 Unemployment: The Bureau of Labor Statistics last month interviewed 60,000 members of the U.S. labor force, of whom 7.2% were unemployed. (a ) State whether the underlined number is a parameter or a statistic (b) Use appropriate notation to describe the underlined number
9.11 IRS Audits: The Internal Revenue Service plans to examine an SRS of individual federal income tax returns from each state. One variable of interest is the proportion of returns claiming itemized deductions. The total number of tax returns in each state varies from almost 14 million in California to fewer than 210,000 in Wyoming. (a) Will the sampling variability of the sample proportion change from state to state if an SRS of 2000 tax returns is selected in each state? Explain your answer.

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