Sample Exam.docx - Sample Exam#1 Elementary Statistics...

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Sample Exam #1 Elementary Statistics Instructions. No books, notes, or calculators are allowed. 1. Some variables that were recorded while studying diets of sharks are given below. Which of the variables are categorical? A. The amount of food eaten in a day by the shark being observed B. The age of the shark being observed C. The type of shark being observed D. The length of the shark being observed 2. When drawing a histogram it is important to 1. use no more than four class intervals, except for categorical variables. 2. leave gaps between the bars. 3. label the vertical axis so the reader can determine the counts or percent in each class interval. 4. make certain the mean and median are contained in the same class interval, so the correct type of skewness can be identified. A study was conducted a small college in Northern California to investigate the mode of transportation used by people entering the campus. From 7 a.m. to 10 p.m., monitors were posted at every entrance to the college on a randomly chosen day. The monitors recorded the mode of transportation used by each person as he or she entered the campus. The following bar chart was constructed based on this information. Page 1 of 12 Elementary Statistics Sample Exam #1 3. If 1,500 people entered campus on this particular day, (approximately how many people arrived by bus?
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In a Business Statistics class with 136 students, the professor records how much money each student has in his or her possession during the first class of the semester. The following histogram is of the data collected. 4. From the histogram, which of the following is true? 5. Which of the following is true of the correlation coefficient r? 1. It is a resistant measure of association. 2. −1≤r≤1. 3. If r is the correlation between X and Y , then −r is the correlation between Y and X. 4. r = 0 means that X and Y are independent of each other. 6. Suppose we fit the least–squares regression line to a set of data. Points with unusually large values of the residuals are called Page 2 of 12 Elementary Statistics Sample Exam #1
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