Mathematics
Grade 12
45 min
Interpret confidence intervals for population means
Tutorial Preview
1
A confidence interval for daily website visitors is (40, 50). Find the sample mean.
2
A study has a 90% confidence level. What does this mean?
3
An interval for average phone battery life is (8, 10) hours. Is 7 hours a plausible value?
Sample Practice Questions
Easy
A 95% confidence interval for the weight of a product is (100, 120) grams. What is the sample mean?
0.100
1.110
2.120
3.10
Easy
A confidence interval for test scores is (80, 90). What is the margin of error?
0.5
1.10
2.85
3.90
Easy
A researcher states they are '99% confident'. What does the 99% refer to?
0.The sample
1.The method
2.The mean
3.The data
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