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Question textWhat is one way that the F-statistic differs from the t-statisticSelect one:a. It can never be negative. b. It has a continuous distribution. c. It depends on degrees of freedom. d. It has a symmetric distribution.
Question 46Correct8.33 points out of 8.33Flag questionQuestion textAccording to the ANOVA test, which statement is true if the variation of treatment means from the grand mean is much larger than the variation within treatment groups?Question 48
Incorrect0.00 points out of 8.33Flag questionQuestion textThe table shows the areas of study chosen by freshmen at a liberal arts college over the last 50 years. The admissions office compares the choices of this year's incoming freshmen to these ratesusing a chi-square test, with a significance threshold of p<0.01. What is the critical value of the test statistic?
Question 50Correct8.33 points out of 8.33Flag questionQuestion textA researcher uses linear regression to analyze the association between people's ages in years and their score on a depression scale. Age is the independent variable in the model, and the number of points on the depression scale is the dependent variable. The mean age is 58, the mean depression score is 7, and the slope of the regression line is 0.2. Based on the regression model, what is the expected depression score of a 72-year-old?Question 51
8.33 points out of 8.33Flag questionQuestion textA researcher is studying the relationship between academic and sports performance in 100 college athletes. She runs a regression model with number of games started as the independent variable and grade point average as the dependent variable. This model yields a slope of b=-0.3. A two-tailed test of this estimate produces a t-statistic of -2.1. Assuming a significance threshold of p<0.05, how should the researcher interpret the results?Select one:a. Each additional game played is associated with a 0.3 point decline in GPA. b. 30% of the variation in GPA can be explained by the number of games played. c. Grade point average and number of games played are positively associated. d. There is no reliable association between GPA and number of games played. Question 52
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Flag questionQuestion textA sociologist wants to examine academic performance across grade levels in an elementary school. The number of students is not the same in each grade. Which sampling method would be most appropriate?Question 56Correct8.33 points out of 8.33Flag questionQuestion textIn research studies, which situation demonstrates self-selection bias?