Question

A 95% confidence interval for the population proportion is found to be (0.355,0.445). a. The point...

A 95% confidence interval for the population proportion is found to be (0.355,0.445).

a. The point estimate for this sample was ?̂ =

b. The margin of error for this sample was

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Answer #1

Solution :

A 95% confidence interval (0.355,0.445)

a) Point estimate = = (Lower confidence interval + Upper confidence interval ) / 2

Point estimate = = (0.355 + 0.445) / 2

Point estimate = = 0.400

b) Margin of error = E = Upper confidence interval -   

Margin of error = E = 0.445 - 0.400

Margin of error = E = 0.045

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