Question

Blood lead levels were examined in 363 adolescents and the average blood lead level was 2.2...

Blood lead levels were examined in 363 adolescents and the average blood lead level was 2.2 and a standard deviation of 0.5. Calculate the lower bound of a 95% confidence interval for the true mean blood lead level of the adolescents.

Math   Statistics-And-Probability   
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Answer #1

Solution :

Given that,

Z = Z0.05 = 1.645

Margin of error = E = Z * ( /n)

= 1.645 * ( 0.5 /  363 )

= 0.04

At 95% lower confidence interval estimate of the population mean is,

- E   

= 2.2 - 0.04 = 2.16

lower bound = 2.16

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