Bank officers are considering targeting young parentswith an offer to start a college savings plan. They havedecided to pursue this new marketing program only if atleast 30% of such parents might be interested in this kindof plan. They surveyed 250 randomly selected parents,of whom 38% indicated some interest. Which formulabelow correctly computes the z-score they should use tosee if this survey result provides evidence that the trueproportion is over 30%?A) z = 0.38 - 0.30A(0.30)(0.70)250B) z = 0.30 - 0.38A(0.30)(0.70)250C) z = 0.38 - 0.30A(0.38)(0.62)250D) z = 0.38 - 0.302250(0.30)(0.70)E) z = 0.30 - 0.382250(0.38)(0.62)
Bank officers are considering targeting young parentswith an offer to start a college savings plan. They havedecided to pursue this new marketing program only if atleast 30% of such parents might be interested in this kindof plan. They surveyed 250 randomly selected parents,of whom 38% indicated some interest. Which formulabelow correctly computes the z-score they should use tosee if this survey result provides evidence that the trueproportion is over 30%?A) z = 0.38 - 0.30A(0.30)(0.70)250B) z = 0.30 - 0.38A(0.30)(0.70)250C) z = 0.38 - 0.30A(0.38)(0.62)250D) z = 0.38 - 0.302250(0.30)(0.70)E) z = 0.30 - 0.382250(0.38)(0.62)
Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section: Chapter Questions
Problem 8CR
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Question
Bank officers are considering targeting young parents
with an offer to start a college savings plan. They have
decided to pursue this new marketing program only if at
least 30% of such parents might be interested in this kind
of plan. They surveyed 250 randomly selected parents,
of whom 38% indicated some interest. Which formula
below correctly computes the z-score they should use to
see if this survey result provides evidence that the true
proportion is over 30%?
A) z = 0.38 - 0.30
A
(0.30)(0.70)
250
B) z = 0.30 - 0.38
A
(0.30)(0.70)
250
C) z = 0.38 - 0.30
A
(0.38)(0.62)
250
D) z = 0.38 - 0.30
2250(0.30)(0.70)
E) z = 0.30 - 0.38
2250(0.38)(0.62)
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