wekk_10_more_review_fall_11

wekk_10_more_review_fall_11 - Statistics 10/ Fall 11 Review...

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Statistics 10/ Fall 11 Review of missing concepts based on review quiz posted online What is the mean and the standard deviation of the distribution of sample means? Choose one answer. a. Xbsar and S b. Mue and S of Xbar c. Mue and sigma d. Xbar and S of X bar Misconception CLT An undergraduate student has been hired to work on a research project. One of the objectives of this project is to find out if the age at which college graduates get married (first marriage) is higher than 25. She reports the following data for a random sample of 255 college graduates. 95% confidence interval for the age at the time of marriage (27, 35) p-value resulting from the test of the null hypothesis: 0.002 Choose one answer. a. The p-value and the confidence interval reported by this student are contradictory and the results do not make any sense. b. The results cannot be trusted because the students should have chosen multiple samples before computing the p-value and the confidence interval. c. Before we can make a decision about rejecting the null we need to know if the null hypothesis was one-tailed or two-tailed. d. Based on these results, we reject the null and conclude that the average age for females who graduate from college is higher than 25. Misconception: P value and confidence interval should give you the same result about testing the null. Based on his P value he rejects the null and based on CI he does not. A researcher wants to find out whether there is any relationship between gender and practicing criminal law. His population of interest is the male and female lawyers who graduated from law schools in the state of New York between 1988 to 2008. What is the best answer? Choose one answer. a. This is a question about Xbar of female lawyers compared to the Xbar of the male lawyers. b. This is a question about the mue of male lawyers compared to the mue of female lawyers. c. This is a question about the p^ of males lawyers compared to the p^ of female lawyers. d. This is a question about P of male lawyers compared to the P of female lawyers.
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This note was uploaded on 12/03/2011 for the course STATISTICS 10 taught by Professor Gould during the Fall '11 term at UCLA.

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wekk_10_more_review_fall_11 - Statistics 10/ Fall 11 Review...

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