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1)A sample of size  is drawn from a population whose standard deviation is  Find the margin of error...

1)A sample of size  is drawn from a population whose standard deviation is  Find the margin of error for a  confidence interval for μ.

2)A researcher wants to construct a 98% confidence interval for the proportion of elementary school students in Seward County who receive free or reduced-price school lunches. What sample size is needed so that the confidence interval will have a margin of error of 0.09?

3)An Internet service provider sampled 540 customers and found that 55 of them experienced an interruption in their service during the previous month. Construct a 95% confidence interval for the proportion of all customers who have experienced a service interruption.

4)Use the given data to construct a confidence interval of the requested level.
x = 78, n = 124, confidence level 98%

Math   Statistics-And-Probability   
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