Chapter 12 Q2

For each of the following scenarios, say whether the data should be treated as independent or paired samples. Explain briey. if paired, explain what the pairing involves. Complete parts a through c. a] An efciency expert claims that a new ergonomic desk chair makes typing at a computer terminal easier and faster. To test it1 30 volunteers are selected. Half of the volunteers will use the new chair and half will use their old chairs. Each volunteer types a randome selected passage for 2 minutes and the number of correct words typed is recorded. Choose the correct answer below. 0 A. The data are paired where the pairing involves the random passages the volunteers type. 0 B. The data are paired where the pairing involves the volunteers who use the new chair and the volunteers who use their old chair. 0 C. The data are independent and not paired. h] A real estate agent wants to know how much extra a replace adds to the price of a house. She selects 50 city blocks. In each block she randomly chooses a house with a replace and one without and records the assessment value. b] A real estate agent wants to know how much extra a replace adds to the price of a house. She selects 50 city blocks. In each block she randomly chooses a house with a replace and one without and retards the assessment value. Choose the correct answer below. 0 A. The data are paired where the pairing involves a house that has a replace or not. Q B. The data are paired by each city block where the houses are compared. 0 C. The data are independent and not paired. c) A manager wants to know if the mean productivity of two workers is the same. For each worker he randomly selects 20 hours in the past month and compares the number of items produced. Choose the correct answer below. O A. The data are paired where each pair consists of an hour in which the productivity of the two workers is compared. O B. The data are independent and not paired. O C. The data are paired where each pair consists of two hours in the number of items produced is compared