Calculate the 90% Confidence Interval for a Sample of N

question 112

Multiple Choice

Calculate the 90% confidence interval for a sample of N = 25 with a mean = 2.75 and standard deviation (s) = .93.

• A) 90% CI = 2.75 ± .33
• B) 90% CI = 2.75 ± .53
• C) 90% CI = 2.75 ± 1.90
• D) 90% CI = 2.75 ± .39

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