Answer:
<em>The error is in Step 3:</em>
She should have calculated the interquartile range as,
Chemistry = 85 - 60 = 25
Biology = 80 - 60 = 20
Step-by-step explanation:
*In a box plot, the median is the point on the number line where a line divides the rectangular box.
Thus, from the information given in the question about the box plots, the median for Chemistry = 80 (this is where a line divides the box)
Median for Biology = 70
The difference in the median = 80 - 70 = 10.
*Lauren didn't make any mistake in Step 1 and 2, as he equally got the same values.
==>The interquartile range in a box plot is simply the difference in the ranges (Q3 - Q1).
From the given information, the interquartile range for Chemistry = 85 - 60 = 25 (this is the difference in the ranges of the box)
Interquartile range for Biology = 80 - 60 = 20
The difference in interquartile range = 25 - 20 = 5
*Lauren made an error in Step 3 when calculating the interquartile range for both Chemistry and Biology, even though he arrive at the same value of the difference in the interquartile range we got as calculated above.
