Question

Check? Please!

Answer 1

Tori did a study on the relationship between students’ grade point averages and the number of hours of TV they watched per day. She found a negative correlation between the two variables. She drew a scatterplot with a line of best fit for her data. Which scatterplot did Tory most likely draw?

D

Answer 2

Just kidding sorry! Yes the answer is D! Negative is going down!

Answer 3

@CrazyCountryGirl negative correlation... it suggests that the more a students watches tv the lesser grade he obtains...so u r correct

Answer 4

Yay! :) Thanks!

Answer 5

but what r those dots about???

Answer 6

scatterplots are like that only

Answer 7

CCG: Can you see any difference between options C and D? If they are different, which is the better choice and why?

Answer 8

One line is diagonal and the other is horizontal

Answer 9

xD

Answer 10

Right, so which option is correct as the solution of this particular problem?

Does the line in D have a particular name?

Answer 11

IDK... I think its D though... @mathmale

Answer 12

@mathmale

Answer 13

That line is your "regression line." You will see that term tossed around a lot. The line is intended to represent a straight line approximation to the relationship between the independent and dependent variables.

In both C and D you have a bunch of dots: a dot plot or a scatter diagram. The line is supposed to represent the possible linear relationship (as mentioned above). Which of the two lines seems to do this better, that in C or that in D?

Answer 14

@mathmale D

Answer 15

I agree. thanks for your patience here. I thought it really important to have a solid reason for choosing whichever option you thought was the correct answer. You've done fine.

Note that the sloping line in D accurately represents the relationship of the data in your scatter plot, whereas the horiz. line in C definitely does not.

Answer 16

Yay! Thanks @mathmale!!!