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1.) What is zα/2 for a 97% confidence level? _________________________________________________ 2.) Customer satisfaction is measured on...

1.) What is zα/2 for a 97% confidence level?

_________________________________________________

2.) Customer satisfaction is measured on a scale between -2 and 2. The last survey estimated mean customer satisfaction to be .39 with a known standard deviation of 3.77. Another survey is going to be taken. Given past results, you really need to have a margin of error of .18 in your 95% confidence interval. What is the smallest sample size that will get you this margin of error?

Math   Statistics-And-Probability   
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