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Author Question: The formula for calculating a confidence interval for a population proportion is based on the rule ... (Read 75 times)

mpobi80

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on: Jul 24, 2018
The formula for calculating a confidence interval for a population proportion is based on the rule of sample proportions, which has assumptions that need to be met. What is the most important assumption that you need to check before applying the confidence interval formula to a sample proportion?

Question 2

Using one divided by the square root of the sample size is known as a conservative' formula for the margin of error for a sample proportion. Explain what that means.


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wfdfwc23

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Reply #1 on: Jul 24, 2018
Answer to Question 1

THE SAMPLE SIZE MUST BE LARGE ENOUGH SO THAT YOU ARE LIKELY TO SEE AT LEAST FIVE OF EACH OF THE TWO POSSIBLE RESPONSES OR OUTCOMES.

Answer to Question 2

THE TRUE MARGIN OF ERROR FOUND BY THE FORMULA 2  (S.D.) IS ALWAYS LESS THAN OR EQUAL TO THIS VALUE. IT IS EQUAL WHEN THE PROPORTION USED IN THE FORMULA FOR S.D. IS .50 .


mpobi80

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Reply 2 on: Jul 24, 2018
Thanks for the timely response, appreciate it

coreycathey

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Reply 3 on: Yesterday
Wow, this really help

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