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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What is a confidence interval?
💡 Hint: Think about the meaning of confidence in statistics.
Question 2
Easy
What do we use to determine the width of a confidence interval?
💡 Hint: Consider what 'error' signifies in sampling.
Practice 4 more questions and get performance evaluation
Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
What does a 95% confidence interval mean?
- 95% of sample means fall within the interval
- 95% of intervals contain the true mean
- 95% likelihood of the sample mean being accurate
💡 Hint: Think about what the interval is intended to reflect in repeated studies.
Question 2
For small samples, which distribution do we use to calculate confidence intervals?
- True
- False
💡 Hint: Consider how different sample sizes affect statistical calculations.
Solve and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
A study on relaxation techniques finds different sample means for various techniques. Calculate the 90% CI for a mean relax time of 15 minutes with a standard deviation of 4 minutes from 25 participants.
💡 Hint: Use the t-value for 90% confidence, adjusting according to the sample size.
Question 2
Two different classrooms' test scores were gathered: Class A mean is 80 with a standard deviation of 5; Class B mean is 85 with a standard deviation of 10. Compare the 95% confidence intervals for both classes to determine which class's performance is more reliable.
💡 Hint: Calculate the intervals for both classes based on their respective means & standard deviations.
Challenge and get performance evaluation