The school’s guidance department compares the grade-point averages and standardized state test scores for 10 students in each grade. The table below shows the correlation coefficient for each data set.

Grade Level and Correlation Coefficient

9th grade 0.3
10th grade –0.1
11th grade 0.2
12th grade –0.8

For which data set(s) is a linear regression model reasonable?

~ 9th grade and 11th grade data sets
~ 10th grade data set
~ 10th grade and 12th grade data sets
~ 12th grade data set

Question

The school’s guidance department compares the grade-point averages and standardized state test scores for 10 students in each grade. The table below shows the correlation coefficient for each data set.

Grade Level   and Correlation Coefficient

9th grade	        0.3
10th grade	        –0.1
11th grade      	0.2
12th grade	        –0.8


For which data set(s) is a linear regression model reasonable?

~ 9th grade and 11th grade data sets
~ 10th grade data set
~ 10th grade and 12th grade data sets
~ 12th grade data set

anonymous · Answer

The first one

anonymous · Answer

Can you explain how you got that answer, please?

anonymous · Answer

@haviles21

anonymous · Answer

It's simple

anonymous · Answer

When comparing data it is usually better to get the data that is closest together. In this case 0.2 & 0.3 is closest. The others aren't as close.

anonymous · Answer

That is what makes it more reasonable.

anonymous · Answer

It said it was incorrect. D:

anonymous · Answer

Which is confusing since what you said did make sense.