Question

Create a scatterplot, and plot y (L2) against x (L1) with the regression line (the equation should be stored in Y1 and the equals sign turned on).
Sketch the scatterplot and regression line in the box below. (The sketch does not need to be perfect.) Does the relationship appear linear? Why or why not?

Answer 1

@jim_thompson5910

Answer 2

I see 3 columns of data, but they ask for two columns L1 and L2

so which 2 do they want you to use?

Answer 3

L1 is hits

Answer 4

L2 is runs

Answer 5

ok, do you have a TI calculator?

Answer 6

yes

Answer 7

and have you entered that data into your calculator?

Answer 8

yes

Answer 9

and you got that result of the image you posted?

Answer 10

yes

Answer 11

idk what to do next and solve this

Answer 12

ok hit the "2nd" key and hit 0 to bring up the catalog

look for DiagnosticOn in the catalog

Answer 13

make sure that is turned on

Answer 14

ok hold on

Answer 15

ok

Answer 16

done

Answer 17

is it on now?

Answer 18

ok good

Answer 19

for some reason, that is off by default and it's really annoying

Answer 20

yah

Answer 21

because that helps us calculate the correlation coefficient r

Answer 22

do the linreg again on L1 and L2

Answer 23

oh ok

Answer 24

you'll see r^2 and r pop up under a and b

Answer 25

can u review me on that

Answer 26

what values of r^2 and r did you get

Answer 27

what buttons do i push?

Answer 28

hit stat button --> go to calc menu (one to the right) --> hit 4 for linreg --> hit enter

Answer 29

ok one sec

Answer 30

i got error

Answer 31

let me try again

Answer 32

ok nvm got it

Answer 33

so you see the values for r^2 and r?

Answer 34

hmm looks like the diagnostic isn't turned on

Answer 35

ok sorry, tell me how to turn it on again plz?

Answer 36

2nd --> 0 key --> look for DiagnosticOn and select it --> hit enter

you should see "done" pop under "DiagnosticOn"

Answer 37

you need the diagnostic on so you can see r^2 and r

it would be nice if they were always on by default. I see no reason to turn them off

Answer 38

how do i select it?

Answer 39

do I just press enter?

Answer 40

highlight it and then hit enter

Answer 41

ok, can u tell me how to highlighit it?

Answer 42

or make sure the arrow is pointing at it

Answer 43

ok

Answer 44

ok, did it, let me try what u told me ealier and ill post the result

Answer 45

alright

Answer 46

ok much better

Answer 47

haha

Answer 48

so now what?

Answer 49

according to this page

http://www.strath.ac.uk/aer/materials/4dataanalysisineducationalresearch/unit4/correlationsdirectionandstrength/

r = 0.519 is between 0.4 and 0.6 which means the linear correlation is moderate. Basically it's in the middle of being nonlinear and linear. Personally, this r value of 0.519 means that the data set if far from being linear that another model is probably better a better fit.

The idea is that the closer r gets to +1 or -1, then the data is more linearly correlated.

Answer 50

Visually you'll have a lot of points that stray far from the regression line. The worse the fit is, the further each point will be. If the points tend to fall on a pattern that is close to a parabola, then a quadratic fit is better. That's just one example though.

Answer 51

ok, so what do i do for the question?

Answer 52

"Does the relationship appear linear?"

I'd say it's not very linear even though r is in the middle of 0 and 1. It has moderate linear correlation but that isn't enough to convince me it's linear. The value of r would have to be closer to 1 (say in the range from 0.7 to 0.9 or so) to be considered linearly correlated

Answer 53

and again, you can look at your scatter plot and the regression line. Does that line look close to all of the points? if no, then the data isn't really linearly correlated

Answer 54

I haven't plotted the data set, but I have a feeling that much of the points will be far from the regression line making the data set not really linearly correlated

Answer 55

how do i create my own scatterplot?

Answer 56

basically the 'r' sums all that up with one number

Answer 57

hit the "y=" key

Answer 58

then move the cursor up to "plot 1" and turn that on

Answer 59

just press enter?

Answer 60

"plot 1" will graph the scatter plot with L1 being x and L2 being y

each point is (x,y) and it's from each row

Answer 61

yes

Answer 62

then go to graph

Answer 63

you may need to change your window

Answer 64

ok one sec, and can u help me with some more problems too plz, u r literally saving my life lol

Answer 65

alright, take your time

Answer 66

ok so one sec, is this right?

Answer 67

btw, I think zoomstat may automatically fit everything in...not sure though

Answer 68

go ahead

Answer 69

yeah looks like you got everything in the picture, but I don't see your axis

Answer 70

how would i do that?

Answer 71

do i have to show the axis?

Answer 72

one sec

Answer 73

ok

Answer 74

there are 51 rows right?

Answer 75

no 50

Answer 76

oh right, I have the top row being my labels

Answer 77

do you have geogebra?

Answer 78

what is that?

Answer 79

ok I'll take that as a no. If you want, you can download that to help you set up the scatterplot and regression line. It's much better than a TI83/TI84/etc and it's free. I'm using that to plot and I got this (see attached). Of course, your TI calculator is fine if you are required to use it, but geogebra allows me to quickly scale and locate points and such

Answer 80

go here to download geogebra

http://www.geogebra.org/

Answer 81

anyways, here is just the scatter plot

Answer 82

ok ty

Answer 83

and as I suspected, it's quite a lousy model since most of the points are nowhere near it

so it's not linearly correlated (well moderately to weakly linearly correlated)

Answer 84

ty

Answer 85

you're welcome