Quiz 1 Solutions

Quiz 1 Solutions - 21 32 32 32 12 33 42 35 36 28 28 17 39...

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BA 240 W. Li Answer Sheet 1 Quiz 1 Problem 1: A high school guidance counselor would like to estimate the annual tuition costs (in U.S. dollars) of community colleges in the United States. He first randomly chose 100 community colleges throughout the United States. Then he went to each chosen college’s official website to gather the data he needed. a) Identify the population. (1 point) All community colleges in the United States b) Identify the sample. (1 point) The randomly selected 100 community colleges in the United States c) Describe the variable of interests. (1 point) The Annual tuition costs (in U.S. dollars) d) Identify the data collection method used. (1 point) Published Sources e) What type of data were collected, quantitative (state ratio or interval) or qualitative (ordinal or nominal)? (1 Point) Quantitative – Ratio Problem 2: Consider following sample of 20 quantitative measurements: 26 34
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Unformatted text preview: 21 32 32 32 12 33 42 35 36 28 28 17 39 31 30 23 27 19 a) Construct a Stem-and-Leaf display, be sure to label your stem and leaf unit clearly. Use your display to answer the following questions: Stem Leaf Unit = 10 Unit = 1 1 2, 7, 9 2 1, 3, 6, 7, 8, 8, 3 0, 1, 2, 2, 2, 3, 4, 5, 6, 9, 4 2 1) What is the Stem Unit? Stem Unit = 10 2) How many Leaves in Stem 3? 10 Leaves in Stem 3 BA 240 W. Li Answer Sheet 2 b) Construct a Relative Frequency Histogram, using class interval width of 5 and the lower boundary of the first class as 10. Use your display to answer the following questions: 1) What is the Frequency for Class Interval 30 34? 7 2) What is the Relative Frequency for Class Interval 35 39? 0.15 3) Describe the shape of the histogram. Left Skewed Interval Frequency Relative Frequency 10 to 14 1 0.05 15 to 19 2 0.1 20 to 24 2 0.1 25 to 29 4 0.2 30 to 34 7 0.35 35 to 39 3 0.15 40 to 44 1 0.05...
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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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Quiz 1 Solutions - 21 32 32 32 12 33 42 35 36 28 28 17 39...

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