Final - Paul 1 Ranjeet Paul Arif Ansari BUAD 310 31 January...

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BUAD 310: Final Exam First name: …………….…….…. . Last name:…………….…….…. . 1. You are doing a one sided, greater than, hypothesis test for the population proportion using a sample of 25, and you get a test statistic of 1.7. This means: A) you cannot reject the null hypothesis at the 10% significance level; B) you can reject the null hypothesis at the 10% significance level, but not at the 5% level; C) you can reject the null hypothesis at the 5% significance level, but not at the 2.5% level; D) you can reject the null hypothesis at the 2.5% significance level. E) There is not enough information to answer this question. 2. The internal auditing staff of a local manufacturing company performs a sample audit each quarter to estimate the proportion of accounts that are current. Determine the sample size needed in order to be 95% confident that the sample proportion of the current customer accounts is within 0.015 of the true proportion of all current accounts for this company. (Hint: use the value of that gives the largest possible ME!) A) 4,268 B) 4,269 C) 3,007 D) 3,006 E) 1,068 3. An investigator hired by a client suing for sex discrimination has developed a multiple regression model for employee salaries for the company in question. In this multiple regression model, the salaries are in thousands of dollars. The model has two explanatory variables, X 1 and X 2 . The dummy variable for gender is statistically significant and is coded as X 1 = 0 if male and X 1 = 1 if female. X 2 measures experience in years. The estimated model is: Salary = 20 - 3X 1 + 2 X 2 . According to the estimated model, A) On average, the effect of one extra year of experience on the salary is greater (by $3000) for males than for females. B) On average, the effect of one extra year of experience on the salary is greater (by $3000) for females than for males. C) The average effect of experience on salary is the same for females and males. D) On average, the effect of one extra year of experience on the salary is greater (by $2000) for males than for females. E) On average, the effect of one extra year of experience on the salary is greater (by $2000) for females than for males. 4. A linear regression model for dependent variable Y and independent variables X 1 , X 2 , and X 3 has a R 2 value of 60%. Then the absolute value of the correlation between X 3 and Y is A) equal to 0.60 B) equal to 0.775 C) no larger than 0.775 D) no less than 0.775 E) Can’t be determined 5. Consider the following multiple regression setting: F=56.25, n=111, k=10. Based on what is given find ± ² A) 0.95 B) 0.77 C) 0.5 D) 0.6 E) Can’t be determined ° ³
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Use the following statscrunch output for predicting the square root of the sales ( Sqrt Sales in the following) for a sales representative to answer questions 6-14 . The regression equation is
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This note was uploaded on 09/11/2011 for the course BUAD 310 taught by Professor Lv during the Spring '07 term at USC.

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Final - Paul 1 Ranjeet Paul Arif Ansari BUAD 310 31 January...

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