Statistics > EXAM > Understandable Statistics Concepts and Methods 12th Edition by Charles Henry Brase – Test Bank (All)

Understandable Statistics Concepts and Methods 12th Edition by Charles Henry Brase – Test Bank

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1. Give an example of a discrete random variable. a. The number of inches of rainfall in a county b. The number of beverages sold at a lemonade stand c. The number of gallons of concrete used at a construction site d. The time required for a runner to finish a marathon e. The temperature of a pot roast cooking in an oven ANSWER: b POINTS: 1 DIFFICULTY: Easy QUESTION TYPE: Multi-Mode (Multiple choice) HAS VARIABLES: False LEARNING OBJECTIVES: 13.65 – Identify a discrete random variable NOTES: Concept DATE CREATED: 11/4/2013 1:58 AM DATE MODIFIED: 11/5/2013 3:46 AM 2. Give an example of a continuous random variable. a. The number of fish caught by a fishing boat b. The number of coins contained in a slot machine c. The number of traffic accidents in a city d. The number of gallons of water in a reservoir e. The number of tables sold at a furniture store ANSWER: d POINTS: 1 DIFFICULTY: Easy QUESTION TYPE: Multi-Mode (Multiple choice) HAS VARIABLES: False LEARNING OBJECTIVES: 13.66 – Identify a continuous random variable NOTES: Concept DATE CREATED: 11/4/2013 1:58 AM DATE MODIFIED: 3/28/2014 3:09 AM 3. Assume that the table below shows the age distribution of nurses in Great Britain in 1851. Make a histogram for the probability distribution. Age range (yr) 20–29 30–39 40–49 Midpoint (x) 24.5 34.5 44.5 Percent of nurses 9.8% 5.6% 19.4% a. b. c. d. e. ANSWER: c POINTS: 1 DIFFICULTY: Medium QUESTION TYPE: Multi-Mode (Multiple choice) HAS VARIABLES: True LEARNING OBJECTIVES: 13.67 – Identify the correct histogram given the data NOTES: Application DATE CREATED: 11/4/2013 1:58 AM DATE MODIFIED: 3/28/2014 3:16 AM 4. What was the age distribution of nurses in Great Britain at the time of Florence Nightingale? Thanks to Florence Nightingale and the British census of 1851, we have the following information (based on data from classic text Notes on Nursing, by Florence Nightingale). Note: In 1851 there were 25,466 nurses in Great Britain. Furthermore, Nightingale made a strict distinction between nurses and domestic servants. Find the probability that a British nurse selected at random in 1851 would be 70 years of age or older. Round your answer to nearest thousandth. Age range (yr) 20–29 30–39 40–49 50–59 Midpoint (x) 24.5 34.5 44.5 54.5 Percent of nurses 5.7% 9.7% 19.5% 29.2% a. 0.091 b. 0

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