MathProblem-Solving & Data Analysis
Practice
Statistics Practice
Original questions on center, outliers, sampling, and experimental design.
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Question 1 of 2
Question 1
Medium
Correct answerThe mean decreases and the median stays the same.
Explanation
Originally the mean is \(10\) and the median is \(5\). Without \(30\), the mean is \(5\) and the median remains \(5\).
Question 2 of 2
Question 2
Hard
Correct answerThe ability to attribute a score difference to the study method
Explanation
Random assignment tends to balance other variables between treatment groups, supporting a causal interpretation of observed score differences.
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Questions to review
No mistakes this time. Excellent work.
- Question 1Analyze the effect of an outlierMedium
- Question 2Evaluate experimental designHard