Question

I am confused, help?

Answer 1

The correlation coefficient for blood pressure and amount of vegetables eaten in a group of people is -0.7. Analyze the following statement:

High blood pressure is caused by not eating vegetables.

Is this a reasonable conclusion?

No; blood pressure and eating vegetables are completely unrelated
No; even though there is a strong negative correlation, not eating vegetables doesn't necessarily cause high blood pressure
Yes; eating vegetables reduces blood pressure, so the opposite is also true
Yes; the correlation coefficient is below -0.5, so that implies causation

Answer 2

@satellite73 @amistre64 @misty1212

Answer 3

@dan815 @mathstudent55

Answer 4

@sammixboo @robtobey

Answer 5

Sorry sis, I am not sure :(

Answer 6

ok Sam, thanks for coming though (:

Answer 7

Maybe @Ashleyisakitty or @Michele_Laino can possibly help

Answer 8

what does the correlation coeff tell us?

Answer 9

and keep in mind that correlation and causation are not the same thing ...

Answer 10

blood pressure and # of veggies?

Answer 11

no, the correlation coeff gives an assessment of how well the data conforms to a linear model (usually a linear model)

if r=1 or -1 there is a strong correlation ... as it moves to zero the data appears more random.

-.7 is a strong correlation ... but does correlation give us causation?

Answer 12

no, no it doesn't

Answer 13

then what would you choose in this case?

Answer 14

I'd say B

Answer 15

b does sound like the most reasonable assessment to me as well.

Answer 16

I knew it had to be A or B but I wasn't sure at first, thanks (:

Answer 17

yw