291Test3sampleTest

291Test3sampleTest - Name: _ MGSC 291 Section: _ Sample...

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Name: _________________________________________________ Section: ________ 1 MGSC 291 Sample Final Exam Please write your name and section on the top of this page. On the answer sheet , please fill in: Your name. The last 4 digits of your SSN in the Student ID Number section (upper right of answer form). Shade the corresponding bubbles below your SSN. This is a closed book and closed notes exam. You may use a calculator and the provided Formula Sheets and z, t and Binomial tables . You have 2.5 hours to complete the test. When you are finished, please turn in all test-related materials. If you do not follow any of the above instructions, then you will lose points on the exam. For each Multiple Choice Question : Identify the one choice that best completes the statement or answers the question. 1. The mean purchase amount for all EarthFare cash register transactions is known to be $32.60 with a standard deviation of $8.90. A sample of 36 recent cash register transactions is randomly selected. There is an 8% chance that the sample mean for the 36 recent transactions is larger than what dollar amount? a) 36.77 b) 33.31 c) 30.51 d) 34.69 e) 45.15 2. The probability distribution for x , the ratings given to Google Chrome by software developers is as follows: x 012345 6 f ( x ) .30 .40 .10 .06 .08 .04 .02 The mean value of x is 1.4 and the standard deviation of x is 1.5. What is the probability that x , a software developer’s rating of Google Chrome, is within 0.8 standard deviations of the mean? a) .56 b) .40 c) .50 d) .80 e) .16
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2 3. Are Republicans more distrustful of the media than Democrats? A study was performed in order to answer this question. A survey with the following 3 items was administered to a sample of Republicans and a sample of Democrats. The responses to each item were given on a scale from strongly agree (+3) to strongly disagree (-3). Item 1: News reporters generally favor one side of the issue in their reports. Item 2: Journalists often invade the privacy of individuals. Item 3: Reporters often mislead the public by quoting people out of context. Using 5% significance levels for both the F -test and t -test, determine the p -value of the hypothesis test that answers the research question: Are Republicans more distrustful of the media than Democrats, on average ? a) .0364 b) .9913 c) .9798 d) .0202 e) .0087 4. A lower -tailed hypothesis test is being performed on a population proportion successes. The sample proportion is .36 and the hypothesized value of the population proportion .30. How would the p -value of the hypothesis test be computed? a) P (p < .30) b) P (p <.36) c) P (pbar < .36) d) P (pbar = .36) e) P (pbar < .30)
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3 5. Of all U.S. firms with paid employees, 20% are female owned. A simple random sample of 300 firms is selected. What is the probability that more than 25% of those firms will be female owned? a) .0150 b) .9770 c) .0230 d) .9850 e) .5987 6. American Airlines knows that before implementing a checked bag fee, the mean weight of passengers’ carry-on items was 16 pounds. The airline would like to know if the mean weight of carry-on items has increased following implementation of the checked bag fee. A random sample of 35 passengers is selected and their carry-on items are weighed. The sample mean is 18.5 pounds and the sample standard deviation is 6.8 pounds. What is the
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291Test3sampleTest - Name: _ MGSC 291 Section: _ Sample...

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