Question

After collecting more data, Mai reports that the proportion of students who think it's a good idea to change school hours is 90% with a margin of error of 3%. What does this mean?

Answer 1

See below

Explanation:

What is margin of error?

Since it is impossible to predict results of a statistical survey on a sample population with 100% accuracy, scientists often include an error in estimation along with the calculated proportion

This margin of error tells you how many percentage points your results will differ from the real population value

• Here the estimated proportion is 90%

• Margin of error is 3%

• So actual population proportion will be 90% ± 3%

• 90 - 3 = 87, 90 + 3 = 93

• So actual proportion will lie between 87% and 90% ANSWER