A study was conducted to determine the proportion of people who dream in black and white instead of color. Among 305305 people over the age of 55, 6666 dream in black and white, and among 306306 people under the age of 25, 1717 dream in black and white. Use a 0.010.01
A study was conducted to determine the proportion of people who dream in black and white instead of color. Among 305305 people over the age of 55, 6666 dream in black and white, and among 306306 people under the age of 25, 1717 dream in black and white. Use a 0.010.01
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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A study was conducted to determine the proportion of people who dream in black and white instead of color. Among
305305
people over the age of 55,
6666
dream in black and white, and among
306306
people under the age of 25,
1717
dream in black and white. Use a
0.010.01
significance level to test the claim that the proportion of people over 55 who dream in black and white is greater than the proportion for those under 25. Complete parts (a) through (c) below.a. Test the claim using a hypothesis test.
Consider the first sample to be the sample of people over the age of 55 and the second sample to be the sample of people under the age of 25. What are the null and alternative hypotheses for the hypothesis test?
Upper H 0H0:
p 1p1not equals≠p 2p2
Upper H 1H1:
p 1p1equals=p 2p2
Upper H 0H0:
p 1p1less than or equals≤p 2p2
Upper H 1H1:
p 1p1not equals≠p 2p2
Upper H 0H0:
p 1p1greater than or equals≥p 2p2
Upper H 1H1:
p 1p1not equals≠p 2p2
Upper H 0H0:
p 1p1equals=p 2p2
Upper H 1H1:
p 1p1greater than>p 2p2
Upper H 0H0:
p 1p1equals=p 2p2
Upper H 1H1:
p 1p1not equals≠p 2p2
Upper H 0H0:
p 1p1equals=p 2p2
Upper H 1H1:
p 1p1less than<p 2p2
Identify the test statistic.
zequals=
(Round to two decimal places as needed.)
Identify the P-value.
P-valueequals=
(Round to three decimal places as needed.)
What is the conclusion based on the hypothesis test?
The P-value is
the significance level of
the null hypothesis. The
alphaαequals=0.010.01,
so
......
re is
evidence to support the claim that the proportion of people over 55 who dream in black and white is greater than the proportion for those under 25.
b. Test the claim by constructing an appropriate confidence interval.
The
9898%
confidence interval is
nothingless than<left parenthesis p 1 minus p 2 right parenthesisp1−p2less than<nothing.
(Round to three decimal places as needed.)
What is the conclusion based on the confidence interval?
Because the confidence interval limits
0, it appears that the two proportions are
Because the confidence interval limits include
values, it appears that the proportion of people over 55 who dream in black and white is
the proportion for those under 25.
▼
▼
equal.
not equal.
▼
▼
lesser than
greater than
not significantly different from
c. An explanation for the results is that those over the age of 55 grew up exposed to media that was displayed in black and white. Can these results be used to verify that explanation?
Yes. The results can be used to verify the given explanation because the difference in proportions is practically significant.
Yes. The results can be used to verify the given explanation because the difference in proportions is statistically significant.
No. The results speak to a possible difference between the proportions of people over 55 and under 25 who dream in black and white, but the results are not statistically significant enough to verify the cause of such a difference.
No. The results speak to a possible difference between the proportions of people over 55 and under 25 who dream in black and white, but the results cannot be used to verify the cause of such a difference.
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