STAT 571 Midterm: STAT 571 UW Madison Fall 01Mid1 Solutions
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1. (a) the display appears roughly symmetric or bell- shaped, centered around 46. 43. 5. (b) the stem and leaf displays for the two groups are. 8|2 (c) median y[0. 50] = 70. (d) young dogs. We can see this because the stem and leaf display for young dogs is generally shifted higher than for old dogs. (it is im- portant to draw both displays using the same stems. ) (e) old dogs. This is apparent because the stem and leaf display for the old dogs is more spread out than for young dogs: since v 2 = 17s2/7. 8 2. P (3. 4 < s2 < 9. 4) = p ( = p (7. 41 < v 2 < 20. 49) From table b, 0. 975 < p (v 2 > 7. 41) < 0. 990 and. So, 0. 725 < p (3. 4 < s2 < 9. 4) < 0. 740. (a) since x n (90, 8), P (y 40) p (z .
