After the Iraq war ended, no weapons of mass destruction were found, but a large

Question

After the Iraq war ended, no weapons of mass destruction were found, but a large minority of Americans believed that WMD's had been found. In July to September 2003, U.S. adults in the equivalent of a large simple random sample of U.S. adults were asked two questions . "Where do you tend to get most of your news? * "Since the war with Iraq ended, is it your impression that the US has or has not found Iragi weapons of mass destruction?" A total of 2508 U.S. adults reported one primary source of news. The rate at which various groups believed that weapons of mass destruction were found, based on where they got their news, is given in the table below Primary source of news Fox CNN NBC / ABC/ CBS Print media PBS /NPR 475 1321 633 79 nPercent who believed WMD's were found 33.05% 20.74% 17.06% 11.39% 1. Is the rate of people who believed that WMD's were found the same for all groups, regardless of where they get their news? What is the appropriate null hypothesis? A. All the population rates are different B. At least one population rate is different from the others C. All the population rates are the same, but that rate is unknown D. All population rates are the same, and that rate is equal to 0.0% (i.e., no misinformation) E. All population rates are the same, and that rate is equal to 21.85%

Explanation / Answer

Answer : Appropriate null hypothesis would be all the population rates are the same, but that rateis unknown.

Option c is correct.

Here option A is automatically incorrect as it is a alternative hypothesis .

OPtion B is the alternative hypothesis.

Option D is half correct but the rate is not equal to 0.0%. This will be null hypothesis when it is asked that if people consider that WMD is found in iraq or not. Now, research question is different so incorrecnt informaton.

Option E is incorrect because that rate of 21.85% is derived from sample statistics, not from some hypothesized percentage. So, it is incorrect.

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