Q1. Which of the following is true regarding the sampling distribution of the mean for a large sample size? a. It has the same shape, mean, and standard deviation as the population. b. It has a normal distribution with the same mean and standard deviation as the population. c. It has the same shape and mean as the population, but has a smaller standard deviation. d. It has a normal distribution with the same mean as the population but with a smaller standard deviation. Q2. According to a survey of American households, the probability that the residents own 2 cars if annual household income is over $25,000 is 80%. Of the households surveyed, 60% had incomes over $25,000 and 70% had 2 cars. The probability that annual household income is over $25,000 if the residents of a household do not own 2 cars is: a. 0.12 b. 0.18 c. 0.40 d. 0.55 Q3. The collection and summarization of the socioeconomic and physical characteristics of the employees of a particular firm is an example of: a. inferential statistics. b. descriptive statistics. c. a parameter. d. a statistic. Q4. The head librarian at the Library of Congress has asked her assistant for an interval estimate of the mean number of books checked out each day. The assistant provides the following interval estimate: from 740 to 920 books per day. If the head librarian knows that the population standard deviation is 150 books checked out per day, and she asked her assistant to use 25 days of data to construct the interval estimate, what confidence level can she attach to the interval estimate? a. 99.7% b. 99.0% c. 98.0% d. 95.4% Q5. Referring to the histogram, how many graduating seniors attended the luncheon? a. 4 b. 152 c. 275 d. 388 Q6. The following are the durations in minutes of a sample of long-distance phone calls made within the continental United States reported by one long-distance carrier. Time (in Minutes) Relative Frequency 0 but less than 5 0.37 5 but less than 10 0.22 10 but less than 15 0.15 15 but less than 20 0.10 20 but less than 25 0.07 25 but less than 30 0.07 30 or more 0.02 Referring to the table, if 10 calls lasted 30 minutes or more, how many calls lasted less than 5 minutes? a. 10 b. 185
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