Exam 12: Voting Methods

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Determine whether a correlation coefficient of r = -0.67 is significant at the 5% level for a sample size of 10.

(Multiple Choice)
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Find the midrange. 36 43 15 12 2 38 40 13

(Short Answer)
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Fifty ten-year-olds were monitored to determine the number of hours per week they spent watching television, surfing the net, and playing video games. The results were used to obtain the frequency distribution below. Construct a frequency polygon for the data. Class Frequency 0-4 2 5-9 7 10-14 7 15-19 15 20-24 10 25-29 5 30-34 3 35-39 1

(Essay)
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Fran's percentile rank on an exam in a class of 500 is 85. Kelly's class rank is 60. Who is ranked higher?

(Multiple Choice)
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Find the mean. 12 8 14 12 11 18 18 12

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Twenty-five people responded to a questionnaire about what types of pets they had. Construct a frequency distribution for the data (D=( D = dogs only, C=\mathrm { C } = cats only, B=\mathrm { B } = both, N=\mathrm { N } = neither).

(Essay)
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To obtain the frequency distribution below, twenty-three babies were monitored for how many times they cried during the night. Construct a frequency polygon for the data. Class Frequency 0-2 4 3-5 6 6-8 9 9-11 3 12-14 1

(Essay)
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Construct a stem leaf plot for the following data. 45 61 72 78 47 79 74 52 55 40 47 75 62 63 54 77 63 78 56 61 49 79 41 53 72 66 47 71 42 64

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These data represent the number of students enrolled at a community college. Draw a time series graph for the data. Year 1985 1986 1987 1988 1989 1990 1991 Number 423 439 432 505 514 520 536

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Assume a data set is normally distributed with mean 129 and standard deviation 35. If the data set contains 350 data values, approximately how many of the data values will fall within the range 59 to 199?

(Multiple Choice)
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Find the equation of the regression line. x 2 7 3 4 5 1 6 y 6 1 5 3 6 12 2

(Short Answer)
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Fifty people participated in a poll to determine their favorite ice cream flavor. Use the data to construct a pie chart. Flavor Number Chocolate 15 Strawberry 8 Vanilla 13 Other 14

(Essay)
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Construct a bar graph for the following information. Eye color Number Blue 513 Brown 892 Green 106 Hazel 327

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Twelve students took a placement exam with the following results. 88 65 98 71 72 94 41 86 45 49 59 75 What is the percentile rank of 71? Round to the nearest percentile.

(Multiple Choice)
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For the 20 test scores shown, find the percentile rank for a score of 66. 75 63 92 74 86 50 77 82 98 65 71 89 75 66 87 59 70 83 91 73

(Multiple Choice)
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For the 20 test scores shown, find the percentile rank for a score of 86. 75 63 92 74 86 50 77 82 98 65 71 89 75 66 87 59 70 83 91 73

(Multiple Choice)
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The average amount customers at a certain grocery store spend yearly is $647.87. Assume the variable is normally distributed. If the standard deviation is $98.39, find the probability that a randomly selected customer spends less than $677.39.

(Short Answer)
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Find the equation of the regression line. x 12 14 10 9 15 8 y 29 35 28 23 36 18

(Multiple Choice)
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The exam grades of 31 students were used to obtain the frequency distribution below. Construct a histogram for the data. Class Frequency 40-49 1 50-59 2 60-69 5 70-79 12 80-89 7 90-99 4

(Essay)
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Find the standard deviation. 33 38 38 46 27 16

(Multiple Choice)
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