1. Suppose the dealer incentive per vehicle for Honda's Acura brand in 2012 is thought to be bell-shaped and symmetrical with a mean of $2,500 and a standard deviation of $300. Based in this information, what interval of dealer incentives would we expect approximately 99.7% of vehicles to fall within? A. $2,200 to $2,800 B. $1,900 to $3,100 C. $1,600 to $3,400 D. $1,300 to $3,700 2. Suppose the average price for new cars in 2012 has a mean of $30,100 and a standard deviation of $5,600. Based on this information, what interval of prices would we expect at least 89% of new car prices to fall within? A. $24,500 to $35,700 B. $18,900 to $41,300 C. $13,300 to $46,900 D. $7,700 to $52,500 7. A psychology class consists of 14 business students and 21 non-business students. Sixteen students in this class are male. Eight students are both female and business majors. The number of men in the class who are not business majors is . A. 6 B. 8 C. 10 D. 11 8. Ten percent of customers who walk into a golf store purchase a golf club and 30% of customers purchase golf balls. Six percent of customers purchase both clubs and balls. The percentage of customers who do not purchase clubs or balls is_________ . A. 0.24 B. 0.35 C. 0.41 D. 0.66 9. Thirty-five percent of customers at a restaurant order an alcoholic drink and an appetizer with dinner. Ten percent of customers do not order alcoholic drink or an appetizer with dinner. Sixty-five percent of diners order an appetizer with dinner. The percentage of customers who order an alcoholic drink but do not order an appetizer is ___________________. A. 0.12 B. 0.25 C. 0.30 D. 0.35 10. According to a survey of business executives, 78% received a pay raise when they asked for one. A random sample of four executives was selected. The probability that all four received a raised when they asked for one is . A. 0.056 B. 0.127 C. 0.237 D. 0.370 11. If a customer at a particular grocery store uses coupons, there is a 50% probability that the customer will pay with a debit card. Thirty percent of customers use coupons and 35% of customers pay with debit cards. Given that a customer pays with a debit card, the probability that the same customer uses coupons is . A. 0.22 B. 0.43 C. 0.60 D. 0.72 12. A company that bakes chocolate chip cookies averages 5.2 chocolate chips per cookie. Assume that the number of chocolate chips per cookie follows the Poisson distribution. What is the probability that a randomly selected cookie will contain one or two chocolate chips? A. 0.0596 B. 0.1033 C. 0.1697 D. 0.2020 13. Assume that the number of customers who arrive at a water ice stand follows the Poisson distribution with an average rate of 6.4 per 30 minutes. What is the probability that three or four customers will arrive during the next 30 minutes? A. 0.1888 B. 0.2365 C. 0.2884 D. 0.3517 14. A camera manufacturer just shipped a batch of 36 digital cameras to local retailers and seven of the cameras have a defective sensor. Cutler Electronics received eight of these digital cameras. What is the probability that three or four of the cameras shipped to Cutler are defective? A. 0.1649 B. 0.2366 C. 0.3417 D. 0.4782 15. A discrete random variable that follows the Poisson distribution with a mean equal to has a counterpart continuous random variable that follows the distribution with a mean equal to = 1/. A. exponential B. normal C. uniform D. discrete 16. The shape of the exponential distribution is . A. symmetrical B. left-skewed C. right-skewed D. flat 17. Assume that the average talk time on an Apple iPhone is 20 hours and that this time follows the exponential probability distribution. What is the probability that a randomly selected iPhone will experience between 10 and 30 hours of talk time? A. 0.3834 B. 0.4650 C. 0.5219 D. 0.5875 18. Suppose the average tread-life of a certain brand of tire is 42,000 miles and that this mileage follows the exponential probability distribution. What is the probability that a randomly selected tire will have a tread-life of more than 40,000 miles? A. 0.1546 B. 0.2410 C. 0.3016 D. 0.3858 19. During the 3 PM to 5 PM time period, cars arrive at a bank's drive-through window at an average rate of 15 customers per hour. Assume that the time between arrivals follows the exponential distribution. What is the probability that a randomly selected customer will arrive more than 10 minutes after the previous customer? A. 0.0821 B. 0.1515 C. 0.2732 D. 0.3670 20. The is used to find the probability that a continuous uniform random variable will fall between two particular values. A. uniform cumulative distribution function B. uniform probability distribution C. continuous uniform probability density function D. uniform probability density function 21. Assume that the amount of time that it takes an employee to service a car at an oil change facility follows the uniform probability distribution between 21 and 38 minutes. What is the probability that a randomly selected car will require less than 25 minutes to service? A. 0.2353 B. 0.3146 C. 0.4860 D. 0.5716 25. The main drawback to using secondary data is that . A. it may be expensive to obtain the data B. the subjects of interest need to be directly observed to collect the data C. the subjects of interest are paid to provide the data D. you have no control over how the data were collected 26. A method of gathering data when subjects are exposed to certain treatments and the data of interest is recorded is known as . A. direct observation B. focus groups C. experiments D. surveys 27. A method of gathering data while the subjects of interest are in their natural environment, often unaware they are being watched, is known as . A. direct observation B. focus groups C. experiments D. surveys 28. A method of gathering data when individuals are paid to discuss their attitudes towards products or services in a group setting controlled by a moderator is known as . A. direct observation B. focus groups C. experiments D. surveys 29. A _____sample does not represent the intended population and can lead to distorted findings. A. random B. probability C. biased D. stratified 30. Class are the number of observations for each class of a frequency distribution using grouped quantitative data. A. boundaries B. frequencies C. widths D. numbers 34. The can found by subtracting the lowest value from the highest value in the data set. A. standard deviation B. variance C. median D. range 35. Suppose the nightly rate for a three-star hotel in Paris is thought to be bell-shaped and symmetrical with a mean of 160 euros and a standard deviation of 8 euros. The percentage of hotels with rates between 144 and 176 euros is _____ . A. approximately 68. B. at least 89. C. approximately 95. D. at least 75. 36. The is found by first determining the index point, i = 0.5(n), where n is the number of data points. A. mean B. average C. median D. mode 37. The measures the variability, or spread, of the data points in a set around the set's mean. A. mode B. variance C. median D. range 38. Comparing the consistency between two data sets when their means are very different is best done with the . A. median B. z-score C. standard deviation D. coefficient of variation 39. When working with grouped data, the is the value in the middle of the class and can be found by taking the average of the endpoints for each class. A. range B. midpoint C. endpoint D. median 40. The ______________ represents the probability that any given confidence interval will not contain the true population mean. A. margin of error B. confidence level C. significance level D. confidence interval