Given x-bar = 3.62 and s = 1.72 and n = 400 Give a 95% Confidence-Interval.

Question

Question

Given x-bar = 3.62 and s = 1.72 and n = 400

Give a 95% Confidence-Interval.

math Statistics-And-Probability

Answer 1

Answer #1

solution:-

given that mean x = 3.62 , standard deviation s = 1.72

and n = 400

95% confidence for z is 1.96

confidence interval formula

=> x +/- z * s/sqrt(n)

=> 3.62 +/- 1.96 * 1.72/sqrt(400)

=> 3.62 +/- 0.1686

=> (3.4514 , 3.7886) four decimal places rounded

Answer 2

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