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Mathematics 12 Online
OpenStudy (anonymous):

PLEASE HELP MEEEE I AM IN DESPERATE NEED OF HELP JUST 2 QUESTIONS: 1. determine a 90% confidence interval for μ if σ=6, x=72, n=81 2. How many people would need to be surveyed on health care to estimate the mean of an entire population to within 2 units if the standard deviation was 12 and we wanted a 92% confidence level?

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