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1. In regression analysis, the residuals represent the: A. difference between the actual y values and their predicted values B. difference between the actual x values and their predicted values C. square root of the coefficient of determination D. change in y per unit change in x 2.In the simple linear regression model, the slope represents the: A. value of x when y = 0 B. change in y per unit change in x C. change in x per unit change in y D. value of y when x = 0 3.The coefficient of determination R2 measures the amount of: A. variation in y that is unexplained by variation in x B. variation in x that is unexplained by variation in y C. variation in y that is explained by variation in x D. variation in x that is explained by variation in y 4.If we are interested in determining whether two variables are linearly related, it is necessary to: A. perform the t-test of the coefficient of correlation ρ B. perform the t-test of the slope β1 C. either A or B since they are identical D. calculate the regression standard error s 5.Which of the following statistics and procedures can be used to determine whether a linear model should be employed? A. The standard error of estimate B. The t-test of the slope C. The coefficient of determination D. All of the above answers are correct 6.The regression standard error s is given by: A. SSE/(n-2) B. √SSE/(n-2) C. (√SSE/(n-2)) (whole thing is under √) D. SSE/√n-2 7.The symbol for the sample coefficient of correlation is: A. r B. ρ C. ρ2 D. r2 8. Given the least squares regression line yˆ=-2.48+1.63x, and a coefficient of determination of 0.81, the coefficient of correlation is: A. -0.85 B. 0.90 C. 0.85 D. -0.90
We know that the population variance is 16. Estimate the mean number of admissions per 24-hour period with a 95% confidence interval.
A chocolate bar is considered underweight if it weights less than 8.0 oz. How should the chocolate bar wrappers be labeled so that only 1% of such bars are underweight.
The population's standard deviation is 2.00 hours per week. Based on a sample of 49 students, Healthy Lifestyles Incorporated (HLI) would like to apply the central limit theorem to make various estimates.
Write a short paragraph that highlights your understanding of why exploratory data analysis is a critical part of any analytical strategy- create a scatterplot that includes a regression line. The variables you will use are: Exam Performance and Ex..
Suppose that by the end of 2009, that percentage was 85%. If a sample of 10 U.S. adults is selected, what is the probability that:
The 90% confidence interval to estimate the true average difference in nationwide sales quantity before the ad campaign and after is (0.39, 16.64). Which of the following is the appropriate conclusion? The differences were calculated as (after ad ..
Professor Green gives two-month computer programming courses during the summer term. Students must pass a number of exams to pass the course, and each student is given three chances to take the exams
1.a sample of 50 male and 50 female infants were put on an experimental infant formula. after two weeks the parents of
Compute the probability that, in a random sample of 500 students, at least 20 lie frequently, assuming the true percentage is 3%.
Organize data into a frequency distribution. How many classes would you propose? What value would you propose for class interval?
Construct the 95 percent confidence interval for the difference between the two population means.
Assume that we randomly select 15 teachers who have recently left their profession. Find the probability that at least 6 of them were laid off.
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