HW 1 - HW 1 A) 2 | 23 3 | 2344567789 4 | 01356889 5 |...

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Unformatted text preview: HW 1 A) 2 | 23 3 | 2344567789 4 | 01356889 5 | 00001114455666789 6 | 0000122223344456667789999 7 | 00012233455555668 8 | 02233448 9 | 012233335666788 10 | 2344455688 11 | 2335999 12 | 37 13 | 8 14 | 36 15 | 0035 16 | 17 | 18 | 9 B) A typical flow rate is approximately 7 L/Min C) It appears to be spread out, somewhat resembling the bell curve. D) It appears to be fairly symmetric, unimodal, but maybe slightly positively skewed. E) 18.9 appears to be an outlier. 21/18 A) It is unimodal and heavily positively skewed. 1 article is the most common amount published. 800 Frequency 0 0 200 400 600 5 10 Number.of.papers 15 B) 11% published at least 5. 3% published at least 10. 2.4% published more than 10. C) No. The interval is essentially from 15 to no limit. This interval is too large and you cannot make the other columns the same size. D) Yes. You can make the other intervals all of width 3 as well. 22/20 A) This appears to be distributed fairly evenly with a slight positive skew. 0 | 1234455555 1 | 0001123334799 2 | 1113344577 3 | 1223449 4 | 48 5 | 23789 B) 48% of the subdivisions have less than a length of 2000, while 36% is in between 2000 and 4000. The shape appears to decrease at a constant rate / be slightly positively skewed. Histogram of C1 Frequency 0 0 2 4 6 8 10 12 1000 2000 3000 C1 4000 5000 6000 24/28 This data appears to be unimodal and symmetrical. It is very heavily compacted with 50% of the data between 108 and 119.5 8|2 9 | 69 10 | 236788889 11 | 001333355889 12 | 1227 13 | 26 14 | 06 30/34 A) The sample mean of U is 21.55 and F is 8.56. These samples differ drastically. B) The sample median of U is 17 and F is 8.9. Once again, these samples are very different. The Median and mean of he Urban differs mainly because of the (outlier) 80 microbial count. C) The trimmed mean and median of U are both 17, while F trimmed has a mean of 8.24 and a median of 8.9. U is trimmed by 9% and F is trimmed by 6.7%. U's sample / trimmed mean and median differed by 4.5 and 8.5 respectively. F's sample / trimmed mean and median remained fairly similar. 31/42 A) The constant c is added to both the sample mean and median. Data: 4, 5, 6, 7, 8, 9, 10 Data + c(10): 14, 15, 16, 17, 18, 19, 20 Mean: 7 Median: 7 Mean: 17 Median: 17 B) The sample mean and median are both multiplied by the constant c. Data: 4, 5, 6, 7, 8, 9, 10 Data * c(5): 20, 25, 30, 35, 40, 45, 50 Mean: 7 Median: 7 Mean: 35 Median: 35 ...
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This homework help was uploaded on 12/13/2007 for the course ENGRD 2700 taught by Professor Staff during the Fall '05 term at Cornell University (Engineering School).

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