Question

The weights of newborn children in Canada are known to be normally distributed with mean 3402g....

The weights of newborn children in Canada are known to be normally distributed with mean 3402g.

Fifty randomly selected newborns are weighed and have a mean weight of 3953g and standard deviation of 583g.

Compute the left end of the 95% confidence interval for the population standard deviation of birth weights. Enter your answer to 1 decimal place.

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Answer #1

Mean = 3953

Sample size (n) = 50

Standard deviation (s) = 583

Confidence interval(in %) = 95

z @ 95.0% = 1.96

Since we know that

Required confidence interval

Required confidence interval = (3953.0-161.5994, 3953.0+161.5994)

Required confidence interval = (3791.4, 4114.6)

The left end of the 95% confidence interval for the population standard deviation of birth weights is 3791.4 g

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