Question

data was collected in the table to the right on how many minutes students studied for a 100 question exam and the number of questions they missed on the exam. 6e) find the equation of the best - fit line. round values to one decimal place. 1) y=-0.26x + 19.8 find the value of the correlation coefficient. 2) round the value to two decimal places. r=-0.88 6a) what does the value of r tell you about this data? 3) there is a weak relationship showing that as the number of minutes studied increases, the number of questions missed increases 6b) the model predicts that joey, who studied for 20 minutes, will miss questions.

Explanation:

Step1: Recall the best - fit line equation

The best - fit line is given as $y=-0.26x + 19.8$.

Step2: Predict for Joey

To find the number of questions Joey will miss, substitute $x = 20$ into the equation $y=-0.26x + 19.8$.
$y=-0.26\times20+19.8$.

Step3: Calculate the value of y

First, calculate $-0.26\times20=-5.2$. Then, $y=-5.2 + 19.8=14.6\approx14.6$.

Answer:

14.6