The following scatter diagram shows
the test results of two exams for a class of 26 students. If Sophia got 84 on exam one, which
of the following would you expect to be her score for exam two?
Here our 𝑥-axis graphs what exam
one test results are, and where our 𝑥s on the 𝑦-axis shows us what they got on
exam two. For example, this first 𝑥 received
a 44 on exam one and a 52 on exam two. This 𝑥 is in position 44, 52.
We want an estimate for Sophia who
received an 84 on exam one. Sophia’s 𝑥-axis would be plotted
at 84. Based on the data we’re given and
other similar points, we would think that Sophia’s score on exam two would fall
somewhere between 84 and 88, and only one of our answer choices falls in that
range. A good estimate for Sofia’s score
on exam two would be 86.