STATS EXAM ONE SOLUTIONS

# STATS EXAM ONE SOLUTIONS - Stat 350 Fall 2006 Exam 1...

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Statistics 350 Fall 2006 Exam 1 page 1 of 2 Stat 350 Fall 2006 Exam 1 Solutions 1. a. This study was: an experiment . b. Was a control used in this study? yes c. For all patients in the study, the number of headache days was recorded. This variable is the response variable. d. Suppose the younger patients generally respond better to acupuncture and that the patients in the untreated group were mostly older (over 50), while those in the real and sham acupuncture groups were generally younger. The variable “age” would be an example of a(n) confounding (lurking) variable. 2. None of these is appropriate 3. According to Starbuck’s International, 32.2% of its entire staff that work at the local coffee shops is Hispanic. This value of 32.2% is a: population parameter 4. For any answers below, when appropriate, INCLUDE YOUR UNITS . a. What type of variable is total delivery time? Quantitative b. The approximate IQR of delivery times for DFW Express: IQR = Q3 – Q1 = 50 – 30 = 20 minutes c. 1.5(IQR) = 1.5(20) = 30, so upper boundary is Q3 + 30 = 50 + 30 = 80 minutes

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## This note was uploaded on 04/09/2008 for the course STAT 350 taught by Professor Gunderson during the Fall '08 term at University of Michigan.

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STATS EXAM ONE SOLUTIONS - Stat 350 Fall 2006 Exam 1...

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