Question

Look in the newspapers, magazines, and other news sources for results of a survey or poll that show the confidence interval, usually shows as a +/- some amount.

• Describe the survey or poll and then describe the interval shown.

• How does knowing the interval, rather than just the main result, impact your view of the results?

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Answer 1

Answer:-

Given That:-

Look in the newspapers, magazines, and other news sources for results of a survey or poll that show the confidence interval, usually shows as a +/- some amount.

• Describe the survey or poll and then describe the interval shown.

• How does knowing the interval, rather than just the main result, impact your view of the results?

Given,

An option poll on small sample or Americans via telephone on a particular topic. The results showed that 66% approved and 30% disapproved among the sample.

Here the margin of error is 4.5% so confidence interval is form 61.5% to 70.5%

Use and meaning of interval :

So the percentage in population approving the decision will likely to be between 61.5% and 70.5%.

So,the estimated confidence interval provides a range of values between which true population value lies long with retain probability (Confidence level).

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