Question

Describe in detail how you would construct a 95% confidence interval for a set of 30...

Describe in detail how you would construct a 95% confidence interval for a set of 30 data points whose mean is 20 and population standard deviation is 3. Be sure to show that you know the formula and how to plug into it.

Also, clearly state the margin of error.

Homework Answers

Answer #1

Solution :

Given that,

= 20

= 3

n = 30

At 95% confidence level the z is ,

= 1 - 95% = 1 - 0.95 = 0.05

/ 2 = 0.05 / 2 = 0.025

Z/2 = Z0.025 = 1.96

Margin of error = E = Z/2* ( /n)

= 1.96 * (3 / 30)

= 1.07

Margin of error = 1.07

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