A random group of eighty-five students in Melbourne high schools takes a course designed to improve their ATAR scores. Based on these students, a 90% confidence interval for the mean improvement in ATAR scores from this course for all Melbourne high school students is computed as (72.3, 91.4) points. The correct interpretation of this interval is:

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if you use a 90% confidence interval often, in the long run, 90% of your intervals will contain the true mean improvement in ATAR scores.

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that 90% of the students in the population should have their scores improve by between 72.3 and 91.4 points.

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that 90% of the students in the sample had their scores improve by between 72.3 and 91.4 points.

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None of the above.

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A random group of eighty-five students in Melbourne high schools takes a course...

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