Stat 053.12 - Quiz 3 Solutions

Stat 053.12 - Quiz 3 Solutions - @ m. RA v2: KA LPATH y...

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Unformatted text preview: @ m. RA v2: KA LPATH y STAT 53-12 Quiz 3 Mob 2?, 2008 Circle your section & TA‘s- name@ 37 38 39 TA: Rick Ravi [Show the steps in your work- It Is not enough just to write down an answer without showing the calculations or expiaining how you got the answer, as the case may he] 1(a) Suppose that for all customers at a department store, the average amount spent is 7 (9 fink $46.35 and the standard deviation is $18.42. For a random sample of 100 customers at i the store, find the probabiiity that the average amount spent is greater than $50.00. vi 7 0’, , E _. we = new -1 @ ilwo ‘3 r 50' 77 P647503 'P .p a. {>( '2: 7 (50“45‘39/l‘3t‘l) __ (b) In a random sample of 120 customers at a discount store, the average amount spent is $25.73 and the standard deviation is $10.27. Find a 97.3 % confidence interval for the population mean amount spent by customers at the discount store. - f arm 0-7.5... are». I 0.5 a. 04%} 5 0- 013’s? Tl: ‘20 i 1.954% S \ I [3 W03 a 10:17} =2> P(7£7w)1: 00138“; W? :> amt : 0.083“ "7 iiffi”gwq :7 0*S'Oro'3ff W : O" I Wolff LU: 2‘21 ml} lei/1: Z0438? ‘ kg ‘ .. , -;\r1 (:1, {W p is 35?“: ’(«6 3 2643 +_ 2mm 423$gr 3‘80” 2. Suppose that in a random sample of 1250 households, 220 tuned in to a popular % siligjng competition. Find a 93 .1 % confidence interval for the population proportion of V households that tuned in to the competition. lg : A 2 3a);- =- 11 1:150 [MILL b 9% 1,} an Is Marge b i 3 t l) i 3 o H "3 7 1+ on "‘3"; "*3 l ‘5"; u ; one 5:, 3M : 04% 5‘: 3(O’Olofl 0,135 + 0,032) ...
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Stat 053.12 - Quiz 3 Solutions - @ m. RA v2: KA LPATH y...

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