Quiz 3 answers - = 25 1.37 or 23.63 to 26.37 8) 80 2.797...

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MAT109DL Quiz #3 Answer Key 1) a) P(X>65.0)=.8944 b) P(67.0<X<80.6)=.7580–.1587=.5993 2) a) Q 1 =69.6 b) 75.0±1.75(8.0)=61.0 to 89.0 3) a) See page 385. b) P( x <27.5)= P( z <–1.58)=.0571 4) a) No, “the number” is not a proportion. A proportion is a percentage. b) ˆ p =0.55 5) a) The margin of error will increase. b) The margin of error will decrease. 6) a) point estimate=28.4, margin of error=4.2 b) We are 90% confident that the mean age is between 24.2 and 32.6 years of age. 7) 25 ± 1.96 4.2 36
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Unformatted text preview: = 25 1.37 or 23.63 to 26.37 8) 80 2.797 6.4 25 = 80 3.58 or 76.42 to 83.58 9) p = 390 600 ; .65 1 .645 .65(.35) 600 = .65 1 .645(.019) = .65 .032 or .618 to .682 10) n 0.25 1.960 .03 2 = 1067.11 Round up to 1068 (The minimum 1067.11 must be rounded up so it wont be less than the minimum, i.e., 1067 would be less than the minimum)....
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