A sample of size n = 80 is drawn from a population whose standard deviation is ? = 10. Part 1 of 2 (a) Find the margin of error for a 90% confidence interval for ?. Round the answer to at least three decimal places. The margin of error for a 90% confidence interval for ? is _____ . Part 2 of 2 (b) If the confidence level were 95%, would the margin of error be larger or smaller? (Choose one) ? , because the confidence level is (Choose one) ?.
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We can look this up in a z-table or use a calculator. The critical value for a 90% confidence interval is 1.645. Show more…
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