Sociology 360Practice exam ID: Structure of actual exam – total 100 points: 5-10 true/false, 10-20 multiple choice, balance free answer.This mock exam has two goals: (1) to give you an experience similar to (but not identical to) that of taking the actual exam,and (2) to give you some review questions.A mock exam may have more questions than the actual exam. There is no guarantee that the actual exam will cover only material on the mock exam or cover it in the same way.Instructions:• Write all your answers – and any parts of your work that you want considered for partial credit – in the blue book provided.• Write your ID on this exam booklet and on your blue book. Put the exam booklet inside the blue book when you are done.• Sign the back of the blue book.• You may do the sections in any order you wish, but make sure that the question number is clearly indicated.• Use this exam booklet as “scratch paper.”• Answer all problems. If you do not know how to do a problem, you may want to skip it and come back to it at the end.• Use your calculator and a copy of the formula card that we supply.• Point values for each problem are stated in the exam.• You do not need to show the details of calculations, unless you want to receive partial credit. If you wish your answer to be considered for partial credit you must show your calculations in the blue book.Partial credit will only be given for work that is seen as a step toward the correct answer. Random facts relating to elements of the question will not get partial credit. • Make clear what is the final answer to the question. If there is any ambiguity, circle the number that is the final answer.2• Points will be based primarily on correct use and interpretation of statistics. • You will lose points if the presentation of results and text are difficult to follow.• Be complete, but do not include irrelevant or unnecessary information. Such irrelevant information may lead us to think that you do not understand the problem or do not know what among the information you provided is actually the answer asked for by the problem. NOTES (If relevant): • On this exam you do not need to check whether or not you can use the normal approximation of the sampling distribution to compute a confidence interval or do a hypothesis test except when the problem explicitly asks you to do so.• Unless the problem explicitly states how the sample was gathered, assume that all samples are generated through simple random sampling.• Problems may give very large test statistics.Good luck!3Practice Exam 1 - Version BPart I: True/False and Multiple Choice (2 points each) (12%)True/False questions. Answer true or false for each statement. 1. The median of a density curve is always the point that divides the area under the curve in half.True False2. Simpson’s paradox results from a variable omitted in the pooled table acting as a lurking variable.True False3. A low value of r2 indicates that a large proportion of the variation in y remains unexplained by the regression.True False4. Lurking variables are one reason we cannot infer causality from an association among two variables.True False5. The height of a density curve for a range of values gives the proportion of observations that fallunder the density curve for that range of values.True False6. If a histogram has a bar that is taller than the other bars then this suggests that the distribution is skewed. True FalsePart II: Multiple Choice (2 points each) (24%)Circle the correct answer below. There is one correct answer to each question. Also, note that manyquestions have “all of the above” or “none of the above” choices. 7. As part of a survey of college students a researcher is interested in the number of cigarettes smoked per day. She records a 1 if the student does not smoke, a 2 if the student smokes at least once a week but not every day, and a 3 if the student smokes at least one cigarette per day,and a 4 if the student smokes more than a pack a day. This variable isa) ordered categoricalb) quantitativec) unordered categoricald) A and Be) A and Cf) B and Cg) A, B, and Ch) None of thesei) Not enough information to tell18. A description of different houses on the market includes the following three variables. Which of the variables is quantitative?a) The square footage of the houseb) The monthly electric billc) The monthly gas billd) A and Be) A and Cf) B and Cg) A, B, and C9. When drawing a histogram it is important toa. have a separate bin for each observation to get the most informative plot.b. make sure the heights of the bars exceed the widths of the bins so that the bars are true rectanglesc. label the vertical axis so that the reader can determine the counts or percent in each bind. make certain the mean and median are contained in the same bin interval, so that the correct type of skewness can be identified. e. A and Bf. A and Cg. B and Ch. A and Di. C and Dj. A, B, C, D2Use the following information to answer questions 10-12:The following histogram represents the distribution of acceptance rates (percent accepted) among 25 business schools in 1997. In each bin, the left endpoint is included but not the right.10. What percent of the schools have an acceptance rate of under 20%?a) .16% b) 4% c)12% d) 16% e) none of these11. What is the approximate width of each bin in this graph?a. 10b. 5c. 3d. none of the above could plausibly be the width of the bin.12. Which of the following intervals include the median of this distribution?a. 30 to 40b. 20 to 30c. 15 to 25d. not enough information to tell___________________________________________________________________________3Use the following box plot of the exam scores in a statistics class to answer questions 13-15. The boxplot is drawn per Moore (e.g. not per StataQuest). 90 75 60 45 3013. Approximately 25% of the students scored belowa) 90 b) 65 c) 75 d) 60 e) not enough information to tell14. The interquartile range of the exam scores is approximatelya) 15 b) 55 c) 65 d) 5 e) none of these15. The maximum exam score is approximatelya) 75 b) 60 c) 65 d) 90 e) none of these__________________________________________________________________________________16. Using data from the fifty states, a researcher calculates the correlation coefficient