Stats II week 6

# Stats II week 6 - stocks Why F Ratio of Variations...

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Sarah Anderson Stats II week 6 Exercises 2, 4, 6 (pages 407 – 408) Exercise 8 (page 417) done 2.) ANSWER: Indeterminate Why?? F Ratio of Variations needs to be stated but is omitted here. In order to perform a "Look-up" in the F Table for the critical F value, the F Ratio of Variations must be stated. 4.) ANSWER: Indeterminate Even though the F Ratio of Variations: 12^2/7^2 = 2.94 there isn't a specification for both sample sizes. Only one (1) of the sample sizes is stated. It is only stated the second sample size = 7 but that the first sample size is omitted. In order to perform a "Look-up" in the F Table: (2.94, Xdf, 6df) for the probability, the first sample size must be stated. 6.) ANSWER: Can conclude with 39.6% probability there is more variation in the oil stocks than utility

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Unformatted text preview: stocks. Why?? F Ratio of Variations: 0.035^2/0.039^2 = 0.805 "Look-up" in F Table: (0.806, 7df, 9df) = 0.604. The probability the variations are different is 1 - 0.604 (39.6%). 8.) One-way ANOVA: Treatment 1, Treatment 2, Treatment 3 Source DF SS MS F P Factor 2 70.40 35.20 5.12 0.025 Error 12 82.53 6.88 Total 14 152.93 S = 2.623 R-Sq = 46.03% R-Sq(adj) = 37.04% Individual 95% CIs For Mean Based on Pooled StDev Level N Mean StDev ------+---------+---------+---------+---Treatment 1 6 9.667 1.751 (-------*-------) Treatment 2 4 15.000 3.367 (---------*---------) Treatment 3 5 12.600 2.881 (--------*--------)------+---------+---------+---------+---9.0 12.0 15.0 18.0 Pooled StDev = 2.623...
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Stats II week 6 - stocks Why F Ratio of Variations...

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