Look at the dot plot. How many butterflies did Julian measure this year? How do you know?
9; each X over the number line represents a data point.
What was the shortest wingspan Julian measured this year?
What was the longest wingspan Julian measured this year?
What was the range of wingspans measured this year?
How would you describe the spread of this data set?
Answers vary; encourage students to notice that the data has a narrow range and that there is a peak around 4 inches.
Where do you think the center of this data is?
Answers vary; students might choose 4 since this value occurs most frequently, or they might choose the range of
Look at the data set from last year. What was the median wingspan?
What was the mean wingspan measured last year?
How do the measures of center for the wingspans from last year compare to the center of the data seen in the wingspans for this year?
The mean and median for last year's wingspans was 4 inches, and the line plot for this year’s wingspans also seems to center on this value.
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