In a survey of 1,000 television viewers,40% said they watch network news programs.For a 90% confidence level,the margin of error for this estimate is 2.5%.If we want to be 99% confident,how will the margin of error change?

A) Since more confidence requires a more narrow interval,the margin of error will be larger.
B) Since more confidence requires a more narrow interval,the margin of error will be smaller.
C) Since more confidence requires a wider interval,the margin of error will be larger.
D) Since more confidence requires a wider interval,the margin of error will be smaller.
E) There is not enough information to determine the effect on the margin of error.

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Katya Fuentes · Accepted Answer

Final Answer : C, Explanation :  When we want to be more confident, we need to have a wider interval to account for more variability in the data. Therefore, as we increase our confidence level from 90% to 99%, the margin of error will increase. This means that we will have a wider range of values within which the true proportion of viewers who watch network news programs is likely to fall.

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