You plan to conduct a survey to estimate the percentage of adults who have had chickenpox. Find the number of people who must be surveyed if you want to be 93% confident that the sample percentage is within three percentage points of the true percentage for the population of all adults.   Assume that nothing is known about the prevalence of chickenpox.

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Q: Determine whether the sample is biased or unbiased

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Q: Calculate normalcdf(106,125,100,15) and give the result. You may check it by finding the z-scores…

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Q: what range of raw scores makes up the middle 40%

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