The New Jersey teacher’s union would like to determine thevariability of the salaries earned by...

The New Jersey teacher’s union would like to determine the variability of the salaries earned by high school teachers in Cape May County. A random sample of 20 teacher salaries from that county was selected and it provided a sample standard deviation of $750. Construct a 95% confidence interval estimate of the population variance and standard deviation for the teacher salaries.

I. The lower limit of the confidence interval of the population variance is?

II. The upper limit of the confidence interval of the population variance is?

III. The lower limit of the confidence interval of the population standard deviation is?

IV. The upper limit of the confidence interval of the population standard deviation is?

Solutions

Expert Solution

sample standard deviation of $750.

then sample variance will be 562500

i) 325319.688

ii) 1199966.317

iii) 570.368

iv) 1095.429

orchestra answered 1 year ago

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