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Created by Terri Street Copyright, 2000

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1,000,0001,000,000 500,000500,000 250,000250,000 125,000125,000 64,00064,000 32,00032,000 16,00016,000 8,0008,000 4,0004,000 2,0002,000 1,0001,000 500500 300300 200200 100100

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Click to return to question, Cont-P to switch to the pen, cross out two incorrect answers, then Cont-A to switch back to pointer.

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Click to return to the question and poll the class

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Click on link to Ask Jeeves, or click on this oval to return to question and ask a friend

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A. parameter, statistic A. parameter, statistic C. proportion, statistic C. proportion, statistic B. statistic, parameter B. statistic, parameter D. proportion, parameter D. proportion, parameter A _______ is a number used to describe a population. A ______ is used to describe a sample.

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Back to Board A. You are CORRECT!

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A. ______________ A. ______________ C. _____________ C. _____________ B.______________ B.______________ D. _____________ D. _____________ Give the symbols for population mean, sample mean, population proportion and sample proportion.

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Back to Board C. SUPERB Answer!

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A. sampling variability A. sampling variability C. Sample Propotion C. Sample Propotion B. sampling distribution B. sampling distribution D. Population Proportion D. Population Proportion This graph represents the _________ of the sample mean of the two numbers when rolling 2 dice 6/36 5/36 4/36 3/36 2/36 1/36 P ( )

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Back to Board B. You Figured it Out!

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A. Smaller, the same A. Smaller, the same C. Larger, n(1-p) C. Larger, n(1-p) B.Larger, np B.Larger, np D. Smaller, n(1-p) D. Smaller, n(1-p) _______ samples give larger spread. As long as the pop.size is at least 10x the sample size, the spread of the sampling distribution is approx. ________ for any pop. size

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Back to Board A. You Can’t be Fooled!

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A. smaller A. smaller C. you can’t tell from C. you can’t tell from the info given B. larger B. larger D. about the same D. about the same A national opinion poll recently estimated that 44% of all adults agree that parents of school-age children should be given vouchers for any public or private school of their choice. The polling organization used a probability sampling method for which the sample proportion has a normal distribution with a standard deviation of 1.5%. If the sample were drawn by the same method from the state of North Carolina (population 9.3 million) instead of from the entire U.S. (population 280 million), would this standard deviation be larger, about the same or smaller?

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Back to Board D. Take a Bow!

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A. the sample size is at A. the sample size is at least 10x the population size C. the population is at C. the population is at least 10x the sample size B. np>= 10 B. np>= 10 and n(1-p)>=10 D. population proportion D. population proportion is close to 1 We can only use the standard deviation formula for when

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Back to Board C. Hooray!

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A. the population is at A. the population is at least 10x the sample size C. p is close to 1 or 0 C. p is close to 1 or 0 B. np>=10 B. np>=10 and n(1-p)>=10 D. the population distribution D. the population distribution is close to normal We can use the normal approximation to the sampling distribution of when

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Back to Board B. Phenomenal!

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A. P ( 0.67) A. P ( 0.67) C. P( 0.67) C. P( 0.67) B. P (p 0.67) B. P (p 0.67) D. P(p 0.67) D. P(p 0.67) If I wanted to find the probability that a sample of 1012 adults in which 67% or fewer say they drink the cereal milk, I would be looking for..

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Back to Board C. Outstanding Performance!

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A. __________ A. __________ D.____________ D.____________ The symbol for the mean of the sampling distribution of the sample proportion is ____. It is equal to ____. C.___________ C.___________ B. ___________ B. ___________

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Back to Board D. You should be proud!

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What sample size would be required to reduce the standard deviation of the sample proportion to 1/8 the original value? A. 1/64 the original A. 1/64 the original C. 8x the original C. 8x the original D. 1/8 the original D. 1/8 the original B. 64x the original B. 64x the original

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Back to Board B. Nothing can stop you now!

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A. less variable A. less variable Averages are _________ than individual observations. C. less normal C. less normal B. more skewed B. more skewed D. more variable D. more variable

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Back to Board A. You are really on the ball today!

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B. ___________ B. ___________ The mean of the sampling distribution of is ______ and the standard deviation is _______ A. ____________ A. ____________ C. ____________ C. ____________ D. ___________ D. ___________

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Back to Board B. Great Answer!

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C. sample mean, C. sample mean, normal, all The Central Limit Theorem states that for large n, the sampling distribution of the ________is approximately _______ for ______ population distributions. A. population mean, A. population mean, normal, normal B. sample mean, B. sample mean, normal, normal D. population mean, normal, all

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Back to Board C. Two more questions to go!

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D. 16x as large D. 16x as large How large must your sample size be to reduce the standard deviation of the sampling distribution of the sample mean to ¼ the original st.dev? A. ¼ as large A. ¼ as large C. 8 times as large C. 8 times as large B. 4x as large B. 4x as large

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Back to Board D. You’re ALMOST a millionaire!

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A. a sample mean A. a sample mean If you were taking the average percentage of time spent on the internet per day for a SRS of size 50 students, what are you finding? B. a sample proportion B. a sample proportion D. a population proportion D. a population proportion C. a population mean C. a population mean

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CONGRATULATIONS! You are prepared for the Ch. 9 Quiz!

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Thanks for playing!

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Sampling Error SAMPLING ERROR-SINGLE MEAN The difference between a value (a statistic) computed from a sample and the corresponding value (a parameter)

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