What statistics is
Statistics uses data to answer a question that has many different answers.
Statistical question: a question with answers that vary. Dot plot: a number line with 1 dot for each answer.
Watch stacks share, sort, and compare
Mean: the total divided by the number of values. Median: the middle value in order. With 2 middle values, the median is the mean of the 2 values. Mode: the value that occurs most often. Range: the greatest value minus the least value.
Try it
Move the dots on a dot plot
- Drag a dot to a new number. You can also click a dot and use the arrow keys.
- Look at the mean line and the median line.
- Read the 4 values below the plot.
Mean
Median
Mode
Range
Quick check
Answer 5 questions. You see your score at the end.