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9. In a statistics class at Penn State University, a group working on a project recorded the time it took each of 20 students to chug a 12-ounce beverage (you can guess what it was), and also recorded body weights for the students. Which statistical technique would be the most appropriate for determining if there is a relationship between chug time and body weight? (Assume that the necessary conditions for the correct procedure are met.) . Regression B. Paired t-test. C. Difference in proportions (PI-P2). . Analysis of variance (ANOVA). 10. The smaller the p-value, the A. stronger the evidence against the alternative hypothesis stronger the evidence for the null hypothesis stronger the evidence against the null hypothesis none of the above 11. Null and alternative hypotheses are statements about: A. population parameters B. sample parameters C. sample statistics D. it depends - sometimes population parameters and sometimes sample statistics 12. A hypothesis test is done in which the alternative hypothesis is that more than 10% of a population is left-handed. The p-value for the test is calculated to be 0.25. Which statement is correct? A. We can conclude that more than 10% of the population is left-handed. B. We can conclude that more than 25% of the population is left-handed. C. D. We can conclude that exactly 25% of the population is left-handed. We cannot conclude that more than 10% of the population is left-handed. 13. Four plots of land, each with different soil types are chosen. 12 corn plants were randomly assigned to one of four plots of land (3 plants in each plot), and the mean heights of the plants plots were compared for the four plots. What statistical procedure should be applied to determine if there is a relationship between mean plant height and soil type? A. Regression B. Paired t-test. C. Difference in proportions (P1-P2). D. Analysis of variance (AOV). 14. In political survey, respondents were asked "If a woman were nominated for President, would you vote for her if she were qualified for the job?" A two-way table Yes No Undecided summarizing the results for 2131 respondents, is shown to the right. What technique Democrat 488 66 123 should be used to determine if there is a statistically significant relationship between Republican 335 64 156 party affiliation and opinion about women being qualified to be President? Independent 523 148 228 A. x2 (chi-squared) test. B. Paired t-test. C. Difference in proportions (P1-P2). D. Analysis of variance (AOV). 15. According to a Gallup Organization news release, a survey of about 1000 randomly selected adults shows that concern about the environment and response year were determined to be significantly related. A cross tabulation of year (2001 versus 2002) in the rows and environment concern in the column yielded 35% (.35) responding in 2001 that they worried "a great deal" about the environment. In contrast, in 2001 42% (.42) responded that way. Which of the following is a 95% confidence interval for the decrease from 2001 to 2002 in the proportion of the population who worry a great deal about the environment? 0.07+1.96 (.42) (.35) 0. 07+1.961 (.07) (.93) A. 1000 B. 1000 C. 0.07+1.961 (.07) (.93) D. 0.07+1.96 (.42) (.58) (.35)(.65) 2000 1000 1000