old_finals.pdf - Final Exam Fall 2016 1 A dummy variable...

This preview shows page 1 - 4 out of 44 pages.

Final Exam, Fall 2016 1) A dummy variable can be assigned up to three values. a) True b) False 2) Transformations may be used when nonlinear relationships exist between the response and explanatory variable when performing regression. a) True b) False 3) The value of the coefficient of determination can never decrease when more variables are added to the model. a) True b) False 4) For statistical tests of significance about the regression coefficients, the null hypothesis is that the slope is 1. a. True b. False 5) If the assumptions of regression have been met, residuals plotted against the independent variable(s) will typically show patterns. a) True b) False 6) The noise in a regression model is assumed to have zero variance. a. True b. False 7) The SSR value indicates how much of the total variability in the dependent variable is explained by the regression model. a) True b) False 8) A uniform distribution has a smaller standard deviation than a mound shaped distribution, since the uniform distribution is flat while the mound shaped distribution is not flat. a. True b. False 9) If a 95% confidence interval for the mean was computed as (25,50), then if several more samples were taken with the same sample size, then 95% of them would have a sample mean between 25 and 50. a. True b. False
Image of page 1

Subscribe to view the full document.

10) 15 cards are selected out of a 52 card deck such that after each card is selected, it is placed back into the deck and the deck is reshuffled. Then the total number of hearts selected follows a binomial distribution. a. True b. False 11) If the equation of the least squares regression line was computed to be y=45.7+3.1x, then the correlation cannot be less than 0. a. True b. False 12) If the equation of the regression line that relates percent blood alcohol (x) to reaction time in milliseconds (y) is y=36 - 1.3x, then the slope tells us that for every percent increase in blood alcohol, we can expect reaction time to go down by 1.3 milliseconds a. True b. False 13) A researcher found the correlation between age of death and number of cigarettes smoked per day to be -0.95. Based just on this information, the researcher can justly conclude that smoking causes early death. a. True b. False 14) When computing confidence intervals for paired differences, only the difference values (x1 x2) are used and not the original values of x1 and x2 to compute the mean and standard deviation. a. True b. False 15) With a large sample size such as n = 100, we do not need to assume the distribution is normal in order to compute a 95% confidence interval for the mean. a. True b. False 16) If a 95% confidence interval for the mean number of hours that students study per week is (18,23), then there is a 95% chance that a randomly selected student will study between 18 to 23 hours per week. a. True b. False
Image of page 2
17) Consider a large number of countries around the world. There is a positive correlation between the number of Nintendo games per person x and the average life expectancy y. Does this mean that we could increase the life expectancy in Rwanda by shipping Nintendo games to that country?
Image of page 3

Subscribe to view the full document.

Image of page 4
  • Spring '15
  • Michael Parzen

{[ snackBarMessage ]}

Get FREE access by uploading your study materials

Upload your study materials now and get free access to over 25 million documents.

Upload now for FREE access Or pay now for instant access
Christopher Reinemann
"Before using Course Hero my grade was at 78%. By the end of the semester my grade was at 90%. I could not have done it without all the class material I found."
— Christopher R., University of Rhode Island '15, Course Hero Intern

Ask a question for free

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern