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Most married couples have two or three personality preferences in common. A random sample of 386 married couples found that 124 had three preferences in common. Another random sample of 562 couples showed that 224 had two personality preferences in common. Let p, be the population proportion of all married couples who have three personality preferences in common. Let p2 be the population proportion of all married couples who have two personality preferences in common. (a) Find a 90% confidence interval for pi - P2. (Use 3 decimal places.) lower limit upper limit (b) Examine the confidence interval in part (a) and explain what it means in the context of this problem. Does the confidence interval contain all positive, all negative, or both positive and negative numbers? What does this tell you about the proportion of married couples with three personality preferences in common compared with the proportion of couples with two preferences in common (at the 90% confidence level)? O Because the interval contains only positive numbers, we can say that a higher proportion of married couples have three personality preferences in common. O Because the interval contains both positive and negative numbers, we can not say that a higher proportion of married couples have three personality preferences in common. O We can not make any conclusions using this confidence interval. O Because the interval contains only negative numbers, we can say that a higher proportion of married couples have two personality preferences in common.

Most married couples have two or three personality preferences in common. A random sample of 386 married couples found that 124 had three preferences in common. Another random sample of 562 couples showed that 224 had two personality preferences in common. Let p, be the population proportion of all married couples who have three personality preferences in common. Let p2 be the population proportion of all married couples who have two personality preferences in common. (a) Find a 90% confidence interval for pi - P2. (Use 3 decimal places.) lower limit upper limit (b) Examine the confidence interval in part (a) and explain what it means in the context of this problem. Does the confidence interval contain all positive, all negative, or both positive and negative numbers? What does this tell you about the proportion of married couples with three personality preferences in common compared with the proportion of couples with two preferences in common (at the 90% confidence level)? O Because the interval contains only positive numbers, we can say that a higher proportion of married couples have three personality preferences in common. O Because the interval contains both positive and negative numbers, we can not say that a higher proportion of married couples have three personality preferences in common. O We can not make any conclusions using this confidence interval. O Because the interval contains only negative numbers, we can say that a higher proportion of married couples have two personality preferences in common.

MATLAB: An Introduction with Applications
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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Most married couples have two or three personality preferences in common. A random sample of 386 married couples found that 124 had three preferences in common. Another random sample of 562 couples showed that 224 had two personality preferences in common. Let p1 be the population proportion of all married couples who have three personality preferences in common. Let p2 be the population proportion of all married couples who have two personality preferences in common. (a) Find a 90% confidence interval for p1 - P2: (Use 3 decimal places.) lower limit upper limit (b) Examine the confidence interval in part (a) and explain what it means in the context of this problem. Does the confidence interval contain all positive, all negative, or both positive and negative numbers? What does this tell you about the proportion of married couples with three personality preferences in common compared with the proportion of couples with two preferences in common (at the 90% confidence level)? Because the interval contains only positive numbers, we can say that a higher proportion of married couples have three personality preferences in common. Because the interval contains both positive and negative numbers, we can not say that a higher proportion of married couples have three personality preferences in common. We can not make any conclusions using this confidence interval. Because the interval contains only negative numbers, we can say that a higher proportion of married couples have two personality preferences in common.
Transcribed Image Text:Most married couples have two or three personality preferences in common. A random sample of 386 married couples found that 124 had three preferences in common. Another random sample of 562 couples showed that 224 had two personality preferences in common. Let p1 be the population proportion of all married couples who have three personality preferences in common. Let p2 be the population proportion of all married couples who have two personality preferences in common. (a) Find a 90% confidence interval for p1 - P2: (Use 3 decimal places.) lower limit upper limit (b) Examine the confidence interval in part (a) and explain what it means in the context of this problem. Does the confidence interval contain all positive, all negative, or both positive and negative numbers? What does this tell you about the proportion of married couples with three personality preferences in common compared with the proportion of couples with two preferences in common (at the 90% confidence level)? Because the interval contains only positive numbers, we can say that a higher proportion of married couples have three personality preferences in common. Because the interval contains both positive and negative numbers, we can not say that a higher proportion of married couples have three personality preferences in common. We can not make any conclusions using this confidence interval. Because the interval contains only negative numbers, we can say that a higher proportion of married couples have two personality preferences in common.
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