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study on a population of 25 two year old chickens showed that they lay an average...

study on a population of 25 two year old chickens showed that they lay an average 21 egg per month. if the standard deviation was 2 eggs. find the 96% interval for the true mean

Math   Statistics-And-Probability   
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Answer #1

Confidence interval = Z*

Sample mean, = 21 eggs

For 96% confidence level, critical value Z* = 1.75

Standard deviation, = 2 eggs

Sample size, n = 25

96% confidence interval = 21 1.75 x

= 21 0.7

= (20.3, 21.7)

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