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Cnfidence Interval & Sample size:Population proportion

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In a survey of 1037 adults from the United States age 65 and over, 643 were concerned about getting the flu. (Source: Harvard School for Public Health).

(a) Find a point estimate for the population proportion p of those
concerned about getting the flu.

Answer:

(b) Construct a 90% confidence interval for the population proportion.

Answer:

(c) Find the minimum sample size needed to estimate the population
proportion at the 99% confidence level in order to ensure that the
estimate is accurate within 4% of the population proportion.

Answer?

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Solution Summary

The solution provides step-by-step method for the calculation of confidence interval and sample size. Formula for the calculation and Interpretations of the results are also included. Interactive excel sheet is included. The user can edit the inputs and obtain the complete results for a new set of data.

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