112_midterm_review_S08

112_midterm_review_S08 - Statistics 112 Professor...

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Statistics 112 Professor Esfandiari Review Midterm Spring 2008 You can have a cheat sheet written on both sides and any kind of calculator. You need to have your ID with you to take the midterm. The midterm will be a combination of multiple-choice and open-ended questions. The following is a sample of questions asked and it does not represent the content that you need to know. The content that you need to know if posted on the Moodle. The best way for review is making sure that you know the answer to the quiz problems , the homework and the lab. Solve these problems before the Wednesday lecture. 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 c) Cluster sampling d) Multi-stage sampling Question 2 (4 points): An HMO is interested to find out if walking helps to reduce the risk of hear problems. This HMO has fifty doctors work for them. They randomly picked 20 doctors and asked each doctor to ask the patients who were 60 years and older to indicate whether they take 2-3 walks per week and whether they have any kind of heart problem. The results indicated that patients who took 2-3 walks per week had fewer cases with heart problems. Choose the best answer. a) This is an experimental study and it shows that walking helps to reduce the risk of heart disease. b) This is an experimental study and it shows that there is an inverse relationship between walking and heart disease. c) This is an observational study and show that walking leads to fewer cases of heart disease. d) This is an observational study and it does not lead us to conclude that walking reduces the risk of heart disease.
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Question 3: Given the following information, what is the best answer: 25 th percentile = 10 50 th percentile = 20 75 th percentile = 60 a) The plot is positively skewed and the best measure of scatter is 40 b) The plot is positively skewed and the best measure of scatter is 50 c) The plot is negatively skewed and the best measure of scatter is 40 d) The plot is negatively skewed and the best measure of scatter is 50 Question 4 (4 points). The objective of a study is to examine the effect of using computers on teaching the normal distribution. 160 students who are enrolled in an introductory statistics class are randomly assigned into two groups. The first group studies the normal distribution through listening to a lecture. The second group studies the normal distribution through listening to a lecture along with exposure to computers. The same teacher teaches both groups. Both groups take the same test on the normal
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This note was uploaded on 06/09/2008 for the course STATS 112 taught by Professor Esfandini during the Spring '08 term at UCLA.

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112_midterm_review_S08 - Statistics 112 Professor...

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