Confidence Interval Worksheet
A Grade 9 math worksheet covering confidence intervals, margin of error, and interpretation of statistical data.
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Confidence Interval Practice
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Read each question carefully and answer to the best of your ability. Show all your work for short answer questions.
1. What does a 95% confidence interval mean?
There is a 95% chance that the sample mean is correct.
We are 95% confident that the true population parameter lies within the interval.
The data has a 95% probability of being normally distributed.
95% of the data falls within the interval.
2. The is a range of values, derived from sample statistics, that is likely to contain the value of an unknown population parameter.
3. The quantifies the amount of random sampling error in a survey's results.
4. A wider confidence interval indicates greater precision in estimating the population parameter.
True
False
5. A survey found that 60% of students prefer online learning, with a margin of error of ±5% at a 99% confidence level. What is the confidence interval for the true proportion of students who prefer online learning?
6. A researcher calculates a 90% confidence interval for the average height of adult males to be (170 cm, 178 cm). Explain what this interval means in the context of the problem.