One-Variable Data
Outliers love to hide in SAT data sets and wreck your mean while barely touching the median, something that many students miss. One-variable data problems reward sharp attention to measures of center and spread.
1. Easy - Quiz 1
Get comfortable with mean, median, mode, and range through direct calculations and real-world data sets.
5 questions
2. Medium - Quiz 1
Go beyond basic calculations: handle even-count medians, outlier effects, weighted averages, and data sets that change when values are added or removed.
5 questions
3. Hard - Quiz 1
Dig into standard deviation comparisons, frequency-table medians, data transformations, interquartile range, and problems that combine multiple statistics at once.
5 questions
average score: 80% (all users)
You'll find mean, median, mode, range, and interquartile range from raw data, frequency tables, or box plots. Know when an outlier distorts the mean but not the median, pick the right statistic for skewed distributions, and avoid confusing IQR with full range.