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Chapter 9 Problems (5)

# Chapter 9 Problems (5) - Assume that a simple random sample...

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Unformatted text preview: Assume that a simple random sample has been selected from a normally distributed population. Find the test statistic t. 21) Test the claim that for the population of female college students, the mean weight is given by [A = 132 lb. Sample data are summarized as n = 20, ; = 137 lb, and s = 14.2 lb.~'Use a significance level of a = 0.1. Find the test statistic t. a) 1.57 B) 1.729 C) 7.04 D) 14.2 E) —1.57 H"I'/hm:/o ’ceg\ skakzstic =4»: i'f" 5.e.* 547 H.'-/‘ *HJZ ' : I '2 ; :33— I32. 4r /20 = 2,, .3 may}; 3"?5‘ : 3-l?g gawgtslé? -.- j.5¥. that." 5 : ”"2. 5,»; sin-lave. duo’s”. 22) Test the claim that the mean lifetime of a particular car engine is greater than 220,000 miles. Sample data are summarized as n = 23, ; = 226,450 miles, and s = 11,500 miles. Use a significance level of a = 0.01. Find the test statistic t. A) 12.9 B) 2.24 C) —2.24 .269 E.) -2.69 H. go"“AI-535 ’ a, a - 5 5 H - .. zzowu r/lo L251 stilt-.54”; 3 i‘ 2—: 2.1313 47 “OI/u“ ‘ .e. a = ”so” .2 7220,0130 - /" :22b,+50-—220,ooo E, IT; -| 5 236.? ‘l : 23%?4 UL: Z ' 3 2. 6 9 . K x = 226’?“ 5 = H.500 Assume that a simple random sample has been selected from a normally distributed population. State the final conclusion. 23) Test the claim that for the population of female college students at a particular university, the man weight is given by p = 132 lb. Sample data are summarized as n = 20, ; = 137 lb, and s = 14.2 lb. Use a significance level of u = 0.]. Hozjl=132 Ha:p3132 State your conclusion about H0. A) t= 1,57. reject H0 B) 2 = 1.57, do not reject H0 @t z 1.57, do not reject H0 D) t: -1.57, do not reject H0 (“A15 cruulﬁoa 35 gm airbase... 03 41M; cud-ulna... @ B @—> 0t‘nr(a«‘.3 (alCt/lloikté 'UA-l '\£!" SkhlS’cJL aa,‘ .& t5 4‘: LE? 3 a A Ha: fit [32 :g 5&0“. ,u" Calchgltl H A,/'l1j-.132 L Les-K ehl‘bbc (elud- ‘3- KW "(11‘ key\ is .4 “A. nus-rejeahuv FANS .S A YtﬂjD-A, 0‘2 do "0" n; '20 I YQ‘JQC" Ha . .-_---m--.-._. ...
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