QUIZ_1d_Answer

QUIZ_1d_Answer - Designed Experiment. e) What type of data...

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BA 240 W. Li Quiz 1 Answer Quiz 1 Answer Problem 1: A group of researchers would like to see whether a massage enables the muscles of tired athletes to recover from exertion faster than usual. They recruited eight amateur boxers to participate in an experiment. After a 10-minutes workout (each boxer threw 400 punches), half the boxers were given a 20-minute massage and half just rested for 20-minutes. Before they returned to the ring for a second workout, the heart rate (beats per minutes) and blood lactate level (micromoles) were recorded for each boxer. a) Identify the population. (2 points) ALL tired athletes. b) Identify the sample. (2 points) The 8 recruited amateur boxers. c) Describe the variable(s) of interests. (2 points) The heart rate (beats per minutes) and blood lactate level (micromoles) OR Whether a massage enables the muscles of tired athletes to recover from exertion faster than usual. d) Identify the data collection method used. (2 points)
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Unformatted text preview: Designed Experiment. e) What type of data were collected, quantitative (state ratio or interval) or qualitative (ordinal or nominal)? (2 Points) Quantitative – Ratio Qualitative – Nominal Problem 2: Consider following sample of 10 quantitative measurements: 27 34 21 32 32 32 22 33 42 36 a) Construct a Stem-and-Leaf display, be sure to label your stem and leaf unit clearly. (5 Points) Stem (unit = 10) Leaf (unit = 1) 2 1, 2, 7 3 2, 2, 2, 3, 4, 6 4 2 b) Construct a Relative Frequency Histogram, using class interval width of 5 and the lower boundary of the first class as 20 . Describe the shape of the Histogram. (5 Points) 0.2 0.1 0.5 0.1 0.1 0.2 0.4 0.6 20 – 24 25 – 29 30 – 34 35 – 39 40 – 44 Relative Frequency Class Interval Relative Frequency Histogram Class Interval Frequency Rel. Freq. 1 20 – 24 2 0.2 2 25 – 29 1 0.1 3 30 – 34 5 0.5 4 35 – 39 1 0.4 5 40 – 44 1 0.1 Right Skewed...
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This note was uploaded on 11/16/2011 for the course BA 240 taught by Professor Li during the Fall '08 term at Bellevue College.

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