10_review_answers_F06

10_review_answers_F06 - 1 Answers to Review Midterm...

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Answers to Review Midterm Statistics 10 Midterm Examination Professor Esfandiari This is an open book and open note exam and you may use a calculator. You may NOT use copies of the on-line quizzes. There are 9 multiple-choice questions and three open- ended questions. In the case of multiple-choice questions, choose one answer only . In the case of open-ended questions be specific, write clearly, and do not repeat yourself. Last Name: ____________________ First Name: _______________________ Student ID: ____________________ Email: ________________________ Questions Possible points Actual points ---------------------------------------------------------------------------------------------------------- 9 Multiple choice Q’s 36 ----------------------------------------------------------------------------------------------------------- Question 10 4 ----------------------------------------------------------------------------------------------------------- Question 11 7 ----------------------------------------------------------------------------------------------------------- Question 12 8 ----------------------------------------------------------------------------------------------------------- - Total points 55 ----------------------------------------------------------------------------------------------------------- Percentage ---------------------------------------------------------------------------------------------------------- 1
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Question 1 (4 points): In a large mid-western university with 30 different departments, they are considering eliminating standardized test scores from their admission requirements. The university wants to find out whether the students agree with this plan. They decide to randomly select 100 students from each department and send them a survey, and follow up with a phone call if they do not return the survey within a week. What kind of sampling plan did they use? a) Simple random sampling b) Stratified random sampling = right answer c) Cluster sampling d) Multi-stage sampling Question 2 (4 points). In the following you are given the scatterplot of X vs. Y for 100 individuals. If you calculate the coefficient of correlation (r) for these data, what value do you expect? a) I expect r to be = - 1 b) I expect r to be = + 1 c) I expect r -0.60 < r < -0.50 d) I expect +0.50 < r < + 0.60 e) I expect r to be close to zero = right answer f) I need the actual data to calculate r Y 16 14 12 10 8 6 4 2 0 X 14 12 10 8 6 4 2 0 2
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Question 3 (4 points). Have not discussed yet An unbiased die with six sides is tossed three times. What is the probability that you will get at least two six’s? a)
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10_review_answers_F06 - 1 Answers to Review Midterm...

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