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Unformatted text preview: @ m. RA v2: KA LPATH y STAT 5312
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 $10.27. Find a 97.3 % conﬁdence interval for the
population mean amount spent by customers at the discount store.  f arm
07.5... are». I 0.5 a. 04%} 5 0 013’s? Tl: ‘20
i 1.954%
S \ I [3 W03 a 10:17} =2> P(7£7w)1: 00138“; W? :> amt : 0.083“ "7 iiffi”gwq :7 0*S'Oro'3ff W
: O" I Wolff LU: 2‘21
ml} lei/1: Z0438? ‘ kg ‘ .. , ;\r1 (:1, {W p is 35?“: ’(«6 3 2643 +_ 2mm 423$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
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u ; one 5:, 3M : 04% 5‘: 3(O’Oloﬂ
0,135 + 0,032) ...
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This homework help was uploaded on 04/18/2008 for the course STAT 053 taught by Professor Balaji during the Spring '06 term at GWU.
 Spring '06
 Balaji

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