Exam 3 Practice Test F2010-1

Exam 3 Practice Test F2010-1 - Practice questions for Exam...

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Practice questions for Exam 3 1. Fill in the blank: The t-distribution with 8 degrees of freedom has ____________________ the standard Normal distribution. A. the same center but is more spread out than B. the same center but is less spread out than C. the same center and spread as D. a different center and a different spread than 2. We use a t-distribution with n –1 degrees of freedom rather than the standard normal distribution whenever A. the Central Limit Theorem does not apply. B. we are using s to estimate σ. C. the population is not Normally distributed. D. we can apply the Law of Large numbers and do not need normality. 3. When analyzing data from a matched pairs experiment where measurements were taken on each individual before and after the treatment, we always analyze A. the mean of the before measurements minus the mean of the after measurements. B. the variability of the effect of the treatment from individual to individual. C. the correlation between the before measurements and the after measurements. D. the differences: for each individual where each difference equals the before measurement minus the after measurement. E. the variation of the before measurements and the after measurements. 4. Fill in the blank: The t-distribution with 4 degrees of freedom is _______________________ the standard Normal distribution. A. flatter and more spread out than B. taller and skinnier than C. the same as D. shaped the same as but has a different center than 5. Standard error of x refers to A. the amount an observed statistic for x differs from its parameter, μ. B. the estimate of the standard deviation of the sampling distribution of x . C. the number of standard deviations that the observed statistic, x , differs from its parameter, μ. D. the maximum amount that a statistic, x , differs from its parameter, μ. 6. Fill in the blank: Standard error of x measures ____________ of the sampling distribution of x . A. shape B. center C. spread or variability 7. The test statistic n s x t μ - = tells us A. the maximum distance between the observed x and the claimed parameter value μ 0 . B. how many standard errors the observed x is from the claimed parameter value μ 0 . C. the variability of the sample x ’s about the claimed parameter value μ 0 . D. the total number of standard deviations, or σ , units x is from the claimed parameter value μ 0 .
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8. Whenever performing an inferential procedure on means using a t-distribution with n < 40, one should always A. try to increase the margin of error. B. use a resampling technique to verify conclusions. C. plot the data and check for strong skewness or outliers. D. simulate the sampling distribution to understand the conclusions. 9.
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This note was uploaded on 10/16/2011 for the course STAT 05604 taught by Professor Brucejaycollings during the Spring '10 term at BYU.

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Exam 3 Practice Test F2010-1 - Practice questions for Exam...

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