CH3 Examples _ McGrawHill

# CH3 Examples _ McGrawHill - Chapter 3 Data Description...

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Chapter 3 Data Description Section 3-2 Measures of Central Tendency

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Chapter 3 Data Description Section 3-2 Exercise #3
61, 11, 1, 3, 2, 30, 18, 3, 7 Find (a) the mean. Find (b) the median. Find (c) the mode. Find (d) the midrange. The data above are the number of burglaries reported for a specific year for nine western Pennsylvania universities.

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X = x n The data above are the number of burglaries reported for a specific year for nine western Pennsylvania universities. 136 9 = 15.1 Find (a) the mean. 61, 11, 1, 3, 2, 30, 18, 3, 7
Find (b) the median. The data above are the number of burglaries reported for a specific year for nine western Pennsylvania universities. MD: 1, 2, 3, 3, 7, 11, 18, 30, 61 MD: 7 61, 11, 1, 3, 2, 30, 18, 3, 7

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Find (c) the mode. Mode = The data above are the number of burglaries reported for a specific year for nine western Pennsylvania universities. 3 61, 11, 1, 3, 2, 30, 18, 3, 7
MD: 1, 2, 3, 3, 7, 11, 18, 30, 61 Which measure of average might be the best in this case? Explain your answer. X = x n 136 9 = 15.1 MD = 7 Mode = 3 61, 11, 1, 3, 2, 30, 18, 3, 7

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Which measure of average might be the best in this case? Explain your answer. The median is probably the best measure of average because 61 is an extremely large data value and makes the mean artificially high. 61, 11, 1, 3, 2, 30, 18, 3, 7 The data set has 6 values from 1-11, then jumps to 18 then jumps to 30 and then 61. This makes the mean high. Especially the value 30.
Chapter 3 Data Description Section 3-2 Exercise #5

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Find (a) the mean, (b) the median, and (c) the mode. A researcher claims that each year, there is an average of 300 victims of identity theft in major cities. Twelve were randomly selected, and the number of victims of identity theft in each city is shown. 574 229 663 372 1,202 88 117 239 465 136 189 75
(a ) X = X n A researcher claims that each year, there is an average of 300 victims of identity theft in major cities. Twelve were randomly selected, and the number of victims of identity theft in each city is shown. X = 4349, n = 12 X 4349 12 - 362 574 229 663 372 1,202 88 117 239 465 136 189 75

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(b) Arrange data in increasing order: A researcher claims that each year, there is an average of 300 victims of identity theft in major cities. Twelve were randomly selected, and the number of victims of identity theft in each city is shown. 75 88 117 136 189 229 239 372 465 574 663 1202 median 574 229 663 372 1,202 88 117 239 465 136 189 75
A researcher claims that each year, there is an average of 300 victims of identity theft in major cities. Twelve were randomly selected, and the number of victims of identity theft in each city is shown. MD = 229 + 239 2 = 234 574 229 663 372 1,202 88 117 239 465 136 189 75 (b) Arrange data in increasing order:

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(c) No data are repeated.
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CH3 Examples _ McGrawHill - Chapter 3 Data Description...

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