Answered: Bank officers are considering targeting…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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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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