Compute a 95% confidence interval for the population mean, based on the sample numbers 21, 28, 33, 34, 25, 26, and 135. What is the margin of error? (Round to two decimal digits) 29.57 37.69 38.80 41.83
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First, we need to find the sample mean (x̄) and the sample standard deviation (s). x̄ = (21 + 28 + 33 + 34 + 25 + 26 + 135) / 7 = 302 / 7 = 43.14 To find the sample standard deviation, we first find the variance: Variance = Σ(x - x̄)² / (n - 1) = [(21-43.14)² Show more…
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