Sample_Final_2 - Student ID Number _ PRINT YOUR NAME _...

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Student ID Number _________________ PRINT YOUR NAME _________________________________ DSCI-207 Spring 2009 Sample Exam Instructions: For multiple choice questions, circle the letter of the BEST answer. For paired choices (with a blank line), CHECK the line next to your choice. For short answer questions, confine your answers to the space reserved. This exam counts 20% of your semester grade. MULTIPLE CHOICE [2 points each] Circle the letter of the BEST answer. 1 The amount of television viewed by today’s youth is of primary concern to Parents Against Watching Television (PAWT). 250 parents of elementary school-aged children were asked to estimate the number of hours per week that their child watches television. Identify the type of data collected by PAWT. A qualitative B quantitative 2 The bar graph (at right) shows the political affiliation of 1,000 registered U.S. voters. What percentage of the voters belonged to one of the traditional two parties (Democratic or Republican)? A 35% B 75% C 25% D 40% 3 The distribution of salaries of professional basketball players is skewed to the right. Which measure of central tendency would be the best measure to determine the location of the center of the distribution? A mode B mean C median D range 4 Four hundred accidents that occurred on a Saturday night were analyzed. The number of vehicles involved and whether alcohol played a role in the accident were recorded. The results are shown below: Number of Vehicles Involved Did Alcohol Play a Role? 1 2 3 or more Total Yes 52 97 21 170 No 28 175 27 230 Total 80 272 48 400 What is the probability that an accident involved a single car without the effect of alcohol? A 1/5 B 7/20 C 7/100 D 13/100 5 Two events, A and B, are independent if p (A and B) = p (A) × p (B) A true B false 6 Classify the following random variable according to whether it is discrete or continuous: The temperature in degrees Fahrenheit on July 4 th in Juneau, Alaska A discrete B continuous Academic integrity is expected of all students of Saint Louis University, whether in the presence or absence of members of the faculty. Understanding this, I declare I have not nor will I give, use, or receive unauthorized aid in this examination. Please sign below. Signature ______________________________________________
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7 Consider the given discrete probability distribution: x 2 4 6 8 p ( x ) 0.14 ? 0.25 0.04 Find the probability that x equals 4. A 1.72 B 0.43 C 0.57 D 2.28 8 A physical fitness association is including the mile run in its secondary-school fitness test. The time for this event for boys in secondary school is known to possess a normal distribution with a mean of 470 seconds and a standard deviation of 60 seconds. Between what times do we expect approximately 95% of the boys to run the mile?
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Sample_Final_2 - Student ID Number _ PRINT YOUR NAME _...

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