A research poll was conducted to investigate opinions about global warming. The respondent who answered yes when asked if there is solid evidence that the earth is getting warmer were then asked to select a cause of global warming. The results for two age brackets are given in the table below. Human Activity 108 Natural Patterns Don't know 7 Under 30 65 and over 41 121 71 43 a. At the 1% significance level, test the claim that age bracket is independent of the choice for global warming. State the null and alternate hypothesis, find the test statistic and p-value, and state the decision. b. Do respondents from both age brackets appearto agree, or is there a substantial difference? c. What distribution is used to do the hypothesis testing? What is different about this distribution?

A research poll was conducted to investigate opinions about global warming. The respondent who answered yes when asked if there is solid evidence that the earth is getting warmer were then asked to select a cause of global warming. The results for two age brackets are given in the table below. Human Activity 108 Natural Patterns Don't know 7 Under 30 65 and over 41 121 71 43 a. At the 1% significance level, test the claim that age bracket is independent of the choice for global warming. State the null and alternate hypothesis, find the test statistic and p-value, and state the decision. b. Do respondents from both age brackets appearto agree, or is there a substantial difference? c. What distribution is used to do the hypothesis testing? What is different about this distribution?

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Description: A research poll was conducted to investigate opinions about global warming. Therespondent who answered yes when asked if there is solid evidence that the earth is gettingwarmer were then asked to select a cause of global warming. The results for two

MATLAB: An Introduction with Applications

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Concept explainers

2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.

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Question

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A research poll was conducted to investigate opinions about global warming. The
respondent who answered yes when asked if there is solid evidence that the earth is getting
warmer were then asked to select a cause of global warming. The results for two age
brackets are given in the table below.
Human Activity
Natural Patterns
Don't know
Under 30
108
41
7
65 and over
121
71
43
a. At the 1% significance level, test the claim that age bracket is independent of the choice for
global warming. State the null and alternate hypothesis, find the test statistic and p-value,
and state the decision.
b. Do respondents from both age brackets appearto agree, or is there a substantial
difference?
What distribution is used to do the hypothesis testing? What is different about this
C.
distribution?

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