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Practice Problems Ch 1

# Practice Problems Ch 1 - Practice Problems Ch 1 12 15 19 20...

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Practice Problems Ch. 1: 12, 15, 19, 20, 21, & 22 12. Explain and give an example for each of the following types of variables: (a) equal- interval, (b) rank-order, (c) nominal, (d) ratio scale, (e) continuous. a) Equal-Interval: Counting of years because different cultures have different starting points b) Rank-Order: Standings in Professional Sports c) Nominal : Political party people vote for d) Ratio Scale: Weight of People and Length of an object e) Continuous: Weight of People and Time-Lengths 15. Following are the speeds of 40 cars clocked by radar on a particular road in a 35-mph zone on a particular afternoon: 30, 36, 42, 36, 30, 52, 36, 34, 36, 33, 30, 32, 35, 32, 37, 34, 36, 31, 35, 20, 24, 46, 23, 31, 32, 45, 34, 37, 28, 40, 34, 38, 40, 52, 31, 33, 15, 27, 36, 40 Make (a) a frequency table and (b) a histogram. Then (c) describe the general shape of the distribution a) A frequency table Value Frequency 15 1 16 0 17 0 18 0 19 0 20 1 21 0 22 0 23 1 24 1 25 0 26 0 27 1 28 1 29 0 30 3 31 3 32 3 33 2 34 4 35 2 36 6 37 2 38 1 39 0 40 3 41 0 42 1 43 0 44 0 45 1 46 1 47 0 48 0

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49 0 50 0 51 0 52 2 b) A histogram c) Describe the general shape of the distribution The general shape is approximately bell shaped. Notice how we can draw a bell shaped curve over the histogram like so and notice how the shape of the histogram fits that curve.
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Practice Problems Ch 1 - Practice Problems Ch 1 12 15 19 20...

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