WA8 - Robert E Goode Thomas Edison State College...

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Robert E Goode Thomas Edison State College STA-201-OL010 Mentor: Steve Stutz Date: 11/04/11 Writing Assignment #8 Exercises Set 13.1 (13.4, 13.6, 13.8) 13.4 Because an x 2 curve is right skewed as opposed to a t-curve that is bell-shaped. 13.6 df = 22 a. X 2 .01 = 40.290 b. X 2 .995 = 8.643 13.8 df = 4 a. X 2 .005 = 14.860 b. X 2 .99 = 0.297 Exercises Set 13.2 (13.16, 13.28) 13.16 Frequencies are 11, 10.5, 12.5, 15 and 1. The assumptions are satisfied. All are 1 or more and exactly 20% are less than 5. 13.28 a. The population consists of last year’s US car sales. The variable is the type of car. b. Yes
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c. Type Of Car Distribution Observed Frequency (OF) Expected Frequency (EF) O-E (O-E)² (O-E) 2 /E Small 0.328 133 164 -31 961 5.86 Midsize 0.448 249 224 25 625 2.79 Large 0.094 47 47 0 0 0 Luxury 0.13 71 65 6 36 0.554 Total 500 9.204 H o : Last year’s type of car distribution for US Car sales is the same from the 1990’s distribution. H a : Last year’s type of car distribution for US Car sales is the different from the 1990’s distribution. Expected Frequencies are presented in column 4 of the above table. The assumptions are satisfied since all expected frequencies are at least 5.
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WA8 - Robert E Goode Thomas Edison State College...

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