STAT 571 Midterm: STAT 571 UW Madison f99Mid1 Solutions
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Using table a w-e find p(z ~1. 96) = . 025 so we set. I. (a) the stem and leaf display is useful for a small data set such as this: -. u. The display appears to be roughly symmetrical, centered at about ii. (b) the median is the middle value (8d1) of the 15 ordered observations. (1:yjrln] (163. 6)z/ls] = 2. 501 (c) we want p( 81. We must convert this to a probability statement about y1. = (n -1)81. /a"- because our tables are in terms ofy1 Let ~ be the mean height of the pin oak seedlings. Ho: 1-1= 1. 3 m and ha: i-1f 1. 3 m. We find the mean height is 8. 7/8= 1. 0875 and we are given that. The p-value is 2p(z ~ -1. 901) = 2p(z ~ 1. 901) = 2 x . 0287 = Thus, the results ~ significant at 10% but not at 5% or. 1%. (a) we want to find y. such that p(y
