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# Test_1_Review_KEY - 53.9 to 101.89 7e We are permitted to...

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#7a 43 Class Width= range / number of classes 48 8.5 so round up to 9 55 55 59 61 63 64 64 Classes Frequency Relative freq 67 43-51 2 3.64% 68 52-60 3 5.45% 70 61-69 6 10.91% 70 70-78 14 25.45% 71 79-87 18 32.73% 71 88-96 12 21.82% 71 55 72 73 74 75 76 78 78 78 78 79 79 82 82 82 82 83 83 84 84 85 86 86 87 87 87 87 87 88 88 90 90 90 90 91 91 92 92 94 94 7b Mean 77.9 Median 82 Variance 144.9 Standard Deviation 12.0 7c Min 43 Q1 71 Q2 = med 82 Q3 87 Max 94 7d If we assume the above data set is approximately normally distributed, we can use the Empirical rule. Then, 95% of the data values will be contained within 2 standard deviations of the mean. Thus, the interval that we want is:
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Unformatted text preview: 53.9 to 101.89 7e We are permitted to use the Empirical rule for bell-shaped and approximately bell-shaped distributions. The histograms in part a indicate non-bell shaped distributions. The Empirical Rule can not be used. The 5-number summary is appropriate to describe the center and spread of the distribution. 43-51 52-60 61-69 70-78 79-87 88-96 2 4 6 8 10 12 14 16 18 20 Frequency Histogram Test Scores Number of Grades Scroll down to see all answers for problem #7...
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## This note was uploaded on 10/22/2011 for the course ACCT 3551 taught by Professor Brown during the Spring '11 term at UNC.

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