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1. In a regression model involving 50 observations, the following estimated regression model was obtained: yˆ=10.5+3.2x1+5.8x2+6.5x3 For this model, SSR=450 and SSE=175. The value of the MSR is: A. 150 B. 3.804 C. 12.50 D. 275 2. In multiple regression analysis involving 10 independent variables and 100 observations, the critical value t for testing individual coefficients in the model will have: A. 100 degrees of freedom B. 10 degrees of freedom C. 9 degrees of freedom D. 89 degrees of freedom 3. A multiple regression analysis involving 3 independent variables and 25 data points results in a value of 0.769 for the unadjusted multiple coefficient of determination. The adjusted multiple coefficient of determination is: A. 0.385 B. 0.877 C. 0.591 D. 0.736 4. Which of the following is not true when we add an independent variable to a multiple regression model? A. The unadjusted coefficient of determination always increases B. The unadjusted coefficient of determination may increase or decrease C. The adjusted coefficient of determination can assume a negative value D. The adjusted coefficient of determination may increase 5. In a multiple regression model, the standard deviation of the error variable ? is assumed to be: A. constant for all values of the independent variables B. not enough information is given to answer this question C. 1.0 D. constant for all values of the dependent variables 6. In multiple regression, the mean of the probability distribution of the error variable ? is assumed to be: A. 0.0 B. 1.0 C. k,where k is the number of independent variables included in the model D. Any value greater than 1 7. In multiple regression analysis, even when there is no linear relationship between any of the independent variables and the dependent variable, then A. the chance of erroneously concluding that the model is useful is substantially less with the F-test than with multiple t-tests B. multiple t-tests of the individual coefficients may still show that some are significant C. we may conclude erroneously that the model has some validity D. all of the above statements are correct 8. A multiple regression model has the form yˆ=8+3x1+5x2-4x3 As x3 increases by 1 unit, with x1 and x2 held constant, then y, on average, is expected to: A. increase by 1 unit B. decrease by 16 units C. increase by 12 units D. decrease by 4 units
A random sample of 20 single men was asked if they would welcome a woman taking the initiative in asking for a date. What is the probability that none of the men will say yes?
In a Gallup poll of 1,038 adults, 540 said that second-hand smoke is very harmful. What is the percentage of adults who said second-hand smoke is very harmful.
In order to estimate the proportion of families who prefer female baby-sitters to male baby-sitters with an error of at most 8 percentage points and with at least 95 percent confidence, how large a sample should be taken?
Internet is 13.4 hours per week, with the sample standard deviation of 6.8 hours. Determine the 95 percent confidence interval for mean time Wired subscribers spend on Internet.
Which measure of central tendency would you use to summarize the data below? Which inferential test would you use to determine if there is a difference in rainfall between the sample 2 and 3?
A national water expert is interested in determining the average amount of lead (in ppm, parts per million) that is found in the Houston, Texas drinking water. To conduct her research, she considers only those residential households within the city l..
USA Today conducted a survey asking readers, "What is the most hilarious thing that has ever happened to you en route to or during a business trip?" a. What kind of sampling method is this?
suppose you work for a company that manufactures electronics. the development analysts estimate that 2 of their
What is the probability of selecting a credit card customer at random and finding the customer charged between $70 and $83? compute the probability of charges less than $54.
Assume that in a hypothesis test with null hypothesis Ho: μ = 14.0 at a= 0.05, that a value of 13.0 for the sample mean results in the null hypothesis not being rejected. That corresponds to a confidence interval result of:
The ages of U.S. aircraft have a mean of 13.0 years and a standard deviation of 7.9 years. If the Federal Aviation Administration randomly selects 35 commercial aircraft for special stress tests, find the probability that the mean age of this samp..
How to calculate expected difference between the samples means, and how does larger variability affect the size of the standard error for the sample mean difference?
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