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During a national debate on changes to health care, a cable news service performs an opinion poll of 500 small- business...

During a national debate on changes to health care, a cable news service performs an opinion poll of 500 small- business owners. It shows that 65 percent of small-business owners do not approve of the changes. Develop a 95 percent confidence interval for the proportion opposing health care changes. Comment on the result
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From the given information, Number of small-business owners (n)-500 The proportion of small-business owners, who do not approve the changes, -0.65 Level of the significance, 0.95 The remaining 5% is divided into two equal halfs. That is, 0.025 for left region and 0.025 for right region. Since, it is two tailed test need to consider only one half of the critical region. That is, need to consider only 0.025. Therefore, the total probability would be, 1-0.025 0.97:5 Determine the critical value using excel function is shown below: z Normsinv(0.975) 1.96

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