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ch06

# ch06 - Ch.6 6.1 1 MULTIPLECHOICE. 1

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Ch. 6 Discrete Probability Distributions 6.1 Discrete Random Variables 1 Distinguish Between Discrete and Continuous Random Variables MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Classify the following random variable according to whether it is discrete or continuous. The number of cups of coffee sold in a cafeteria during lunch A) discrete B) continuous 2) Classify the following random variable according to whether it is discrete or continuous. The height of a player on a basketball team A) continuous B) discrete 3) Classify the following random variable according to whether it is discrete or continuous. The cost of a Statistics textbook A) discrete B) continuous 4) Classify the following random variable according to whether it is discrete or continuous. The blood pressures of a group of students the day before their final exam A) continuous B) discrete 5) Classify the following random variable according to whether it is discrete or continuous. The temperature in degrees Fahrenheit on July 4th in Juneau, Alaska A) continuous B) discrete 6) Classify the following random variable according to whether it is discrete or continuous. The number of goals scored in a soccer game A) discrete B) continuous 7) Classify the following random variable according to whether it is discrete or continuous. The speed of a car on a Los Angeles freeway during rush hour traffic A) continuous B) discrete 8) Classify the following random variable according to whether it is discrete or continuous. The number of phone calls to the attendance office of a high school on any given school day A) discrete B) continuous 9) Classify the following random variable according to whether it is discrete or continuous. The age of the oldest student in a statistics class A) continuous B) discrete 10) Classify the following random variable according to whether it is discrete or continuous. The number of pills in a container of vitamins A) discrete B) continuous Page 161

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11) The peak shopping time at home improvement store is between 8 - 11:00 am on Saturday mornings. Management at the home improvement store randomly selected 55 customers last Saturday morning and decided to observe their shopping habits. They recorded the number of items that each of the customers purchased as well as the total time the customers spent in the store. Identify the types of variables recorded by the home improvement store. A) number of items - discrete; total time - continuous B) number of items - continuous; total time - continuous C) number of items - continuous; total time - discrete D) number of items - discrete; total time - discrete 12) The number of violent crimes committed in a day possesses a distribution with a mean of 2.1 crimes per day and a standard deviation of four crimes per day. A random sample of 140 days was observed, and the sample mean number of crimes for the sample was calculated. The data that was collected in this experiment could be measured with a __________ random variable.
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