Solutions01

# Solutions01 - Solutions to Homework 1 Ans 1 The following...

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Solutions to Homework 1 Ans 1. The following is a dotplot of the interval times: 91 84 77 70 63 56 49 42 INTERVAL Dotplot of INTERVAL Ans 2. The following is a stemplot of the interval times: Stem-and-leaf of INTERVAL N = 222 Leaf Unit = 1.0 3 4 234 11 4 55788999 39 5 0011111111111111222333334444 54 5 555566677778889 67 6 0000111112223 78 6 66677788999 107 7 00000111112222233333333344444 (44) 7 55555555555555566666666667777777788888889999 71 8 0000000000000111111111222222222233333333444444444 22 8 5666666788899 9 9 00011134 1 9 5

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Ans 3. The following is a histogram of the interval times with bins of width 3 minutes starting from 41. 95 86 77 68 59 50 41 35 30 25 20 15 10 5 0 INTERVAL Frequency Histogram of INTERVAL Ans 4. The following is a cumulative relative frequency histogram of the interval times: 90.0 82.5 75.0 67.5 60.0 52.5 45.0 100 80 60 40 20 0 INTERVAL Cumulative Percent Histogram of INTERVAL
Ans 5. MINITAB yields the following descriptive statistics for interval times: Descriptive Statistics: INTERVAL Variable N N* Mean SE Mean StDev Minimum Q1 Median Q3 INTERVAL 222 0 71.009 0.859 12.799 42.000 60.000 75.000 81.000 Variable Maximum INTERVAL 95.000 This, clearly is consistent with the fact that the mean is 71 minutes and the median is 75 minutes.

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• Spring '05
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