302 HW 17

# 302 HW 17 - groups Similarly the number of no answers is Y...

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M302 HOMEWORK #17 Dr. Schurle Assignment: page 581, #4, 5, 9, 10, 11, 14, 17, 19 Grade the following for 2 points each, with two points total for work on the remaining problems. #4. 100% [or very nearly 100%, because if a person uses e-mail, they will almost certainly also use the Web.] #9. a) N + 3Y = 78 b) Y + 3N = 250 – 78 = 172 From a) we get N = 78 – 3Y and substituting this for N in Equation b) gives Y + 3(78 – 3Y) = 172, then Y + 234 – 9Y = 172, then -8Y = 172 – 234 = -62 so Y = 62 8 = 31 4 . Finally, the number of studens who used drugs recently would be about 4Y = 31. [In this analysis, Y is the number of students in each of the four groups (HH, HT, TH, TT) who have actually used drugs recently. The students in group HH lie, so the number of yes answers is N (from group HH) plus 3Y (from the other three
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Unformatted text preview: groups). Similarly the number of no answers is Y plus 3N. This gives the two equations a) and b).] #14. The sample size was probably very small, like 2 or 4, because it is very unlikely that actually half of all college students believe more homework should be assigned in all classes. #17. You would expect to see the responses from the library group to be considerably larger than the responses from the party group, because those in the library group are studiers and those at the party are probably not. Note: As usual, material inside [ ] need not be part of the student's answer, but in fact explanations are asked for in #14 and #17. In #9, the problem does not ask the student to show any work, so a bare answer of 31 would be acceptable....
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