You found a 90% confidence interval for the mean number of tongue flicks per 20 minutes for

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You found a 90% confidence interval for the mean number of tongue flicks per 20 minutes for all juvenile common lizards to be from 456.4 to 608.0. Obtain the margin of error by

a. Taking half the length of the confidence interval.

b. Using Formula 8.1.


Formula 8.1

The margin of error for the estimate of μ is zα/2 · σ/ √n, which is denoted by the letter E. Thus,

x̄ = 20, n = 36, σ = 3, confidence level = 95%

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