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# test4key2 - 9 All Emmi has two independent samples Cine...

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Unformatted text preview: 9. All Emmi has two independent samples. Cine sample has n 1variance of Ell and a size of Ill. The other sample has a variance of 12 and a sample size of 12. Estimate the degrees of freedom. l2.— 3 2 %+ (2H) .._.___ ‘3 .. —~—-—— = .2... £16393” la 10-1 1. a) II wants to +s£el if them is a difference between the heart rate at individuals that drink decaﬂeinated coffee and those dial: drinlt regular coﬁ'ee. He collects a sample of three deeaﬁeiuated coﬂee drinkers and four regular coifee drinkers. Calculate the test statistic, state the critical value, come to a conclusion about the null hypothesis, and state what the conclusion is about the relationship hetweea caffeine and heart rate. ' «:2 7.1‘ __ ""3— _ ecaf Re 31' t A r: ﬂ __,__ 7" ?ﬁﬁ Ha “-‘1‘ w as -~t1 12: 1. +1531! 5:51 a a s s “-3. a a “r 16 “Li 9, I 11 #13,;1 _ Haip'TZJE’ECY' «f5: . \$4: ,5 _ _ 551.} 3 .- [C3 TZ) MW cWLE’Aﬁ-E 13-13. KEN—'6 believes that long distance runners do better ifthey take energy gels. than if the).r dim' t She took a simple random snmpl e , of 5 nmncrs and recorded their ﬁnish times with and without gels Calculate the test stat-i stic criti cal value and state whether Kate should reject DI tail to reject the null hypothesis. Theo state 1nirhnl. this means with regards to the use of gels. M Without Wrth 5. “3&3! a: 50 47 52 41 ~+ri ' S 2.5 3: :3 ,2; e 3r. ﬁns“: \$.53 5“ t :1 :3, i ‘EE 2 We Q E? The maﬁaﬁfﬁ 14-15. Jamie wants to see who has longer hair, Northern or Southern Uahihrnisns. He gets a simple random sample of four Southern Califomians and another simple random sample of four Northern Californians. Please calculate the test statistic, state the critical value, shite whether Adam should reject or fail to reject the null hypothesis, and than state what that means with regards to this speciﬁc experiment. . '55 __ l. S EEEEEIE Sogiern ': . -— 29 36 a - H 1Z1 ﬁttlgﬁ; “*‘lC’ t H32 li- 3:30 i [.6 :5 like :15: l3 l9? asst—sagas: 3?:- E m 7s] 2'54 16. Whtm we shite that there is humanity of variance, precisely which variances are hermigeneous'i‘ Lac words, not a 1?. Oh, we' re hart enough test for now. Here are it! free points. 13. Wt? YUM want 10 more Free points? Dita)", here the}r are. You still have to cross oft-thrice other quot-aliens. . ...
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