MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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A study was conducted to determine the proportion of people who dream in black and white instead of color. Among 324 people over the age of 55, 61 dream in black and white, and among 301 people under the age of 25, 18 dream in black and white. Use a 0.05 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.
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?
Identify the test statistic.
(round to two decimal places as needed)
Identify the P-value.
(round to three decimal places as needed)
The P-value is ___________ ( less than/greater than) the significance level α, so __________ ( reject/fail to reject) the null hypothesis. There is ________ ( sufficient/insufficient) 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.
Test the claim by constructing an appropriate confidence interval
( round to three decimal places as needed)
The 90% confidence interval is _____ < (p1−p2) < _______
What is the conclusion based on the confidence interval?
Because the confidence interval limits _________(include/don’t include) 0, it appears that the two proportions are _________ ( equal/not equal) Because the confidence interval limits include ________ ( only negative/only positive/both negative and positive) values, it appears that the proportion of people over 55 who dream in black and white is ___________ ( greater than/less than/not significantly different from the proportion for those under 25.
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?
A 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.
B.
Yes. The results can be used to verify the given explanation because the difference in proportions is practically significant.
C.
Yes. The results can be used to verify the given explanation because the difference in proportions is statistically significant.
D.
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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