Quiz 2 Solutions

Quiz 2 Solutions - 511 41 1 10 6 373 1 2 2 n x x s 443 6...

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BA 240 W. Li Answer Sheet QUIZ 2 Show your work clearly and completely. Keep THREE digits after decimal point. Problem 1: Consider following sample of 10 quantitative measurements: 32 28 28 16 38 31 30 23 27 19 a) Calculate the Measures of Central Tendency, and use them to answer Question 1 in the Assessment. (1 point) Mean: 27.2 Median: 28 Mode: 28 b) Describe the shape using part a). Justify your answer. (1 point) Skew to LEFT since Mean < Median c) Calculate the Five-number Summary, and use them to answer Question 3 and 4 in the Assessment. (2 points) Min Q1 Median Q3 Maximum 16 23 (3 rd #) 28 31 (8 th #) 38 d) Calculate the variance and the standard deviation. (2 points)
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Unformatted text preview: 511 . 41 1 10 6 . 373 1 ) ( 2 2 n x x s 443 . 6 511 . 41 2 s s e) Find the z-score for the Minimum. (1 point) 738 . 1 443 . 6 2 . 27 16 s x x z f) Assume data is normal. Construct an interval that will include the middle 68.26% of the data set above. (2 points) Consider using Empirical Rule: 68.26% means within the range of: s x Lower Interval = 757 . 20 443 . 6 2 . 27 s x Upper Interval = 643 . 33 443 . 6 2 . 27 s x g) Count how many data actually fall into the interval in part f), and what is the percentage of the data? (1 point) 7 data fall into the range of (20.757, 33.643). Thus, 70% of data fall into the range in part f)....
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This note was uploaded on 05/15/2011 for the course BA 240 taught by Professor Li during the Spring '08 term at Bellevue College.

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