From a survey of coworkers you find that 70% of 120 have already received this y

Question

From a survey of coworkers you find that 70% of 120 have already received this year's flu vaccine. An approximate 98% confidence interval is (0.603, 0.797). a) How would the confidence interval change if the sample size had been 1080 instead of 120? b) How would the confidence interval change if the confidence level had been 90% instead of 98%? c) How would the confidence interval change if the confidence level had been 99% instead of 98%? a) Select the correct choice below and fill in the answer box within your choice. A. The new confidence interval would be wider. The standard error would be multiplied by a factor of. B. The new confidence interval would be narrower. The standard error would be divided by a factor of .

Explanation / Answer

aa) option B is correct. the new confidence interval would be narrower . The std errror would be divided by a factor of

=(1080/120)1/2 =3

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