302 HW 18 - you count down from the largest or up from the...

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M302 HOMEWORK #18 Dr. Schurle Assignment: page 602, #1, 2, 4, 6, 7, 10, 22, 23, 24, 25, 26 Grade the following for 2 points each, with two points total for work on the remaining problems. #4. The standard deviation must be 10.3, because the spread from 72 to 100 is too large to have a standard deviation of just 2.7. [In fact, a spreadsheet gives the standard deviation as 10.28.] #10. The data set for “Amount” is the only one that seems to have a normal [or bell-shaped] distribution. The mean for that distribution is about 75. #23. The mean quiz grade is 84.125 [add up the scores and divide by 8]. The median quiz grade is either 87 or 84 or 85.5,[ depending on whether
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Unformatted text preview: you count down from the largest or up from the smallest or take the average of the middle two.] An 80 on the next exam would bring the mean score down,[ because the 80 is smaller than the current mean grade,] and an 80 on the next exam would make the median 84, so up/down/the same depends on exactly how you calculate the median in the first place. #24. 80 would be the lowest grade that would raise the mean grade. In general, to raise the mean, the next measurement must be larger than the current mean. [The current mean for the student is 79.375.] NOTE: Again, as always, material in does not have to be part of the student's answer....
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This note was uploaded on 03/19/2008 for the course M 302 taught by Professor Irwin during the Spring '08 term at University of Texas at Austin.

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