STA 210 Ch 12 HW

What is the measurement level of the two variables "smoking status" and "myocardial infarction"?

Both are nominal.

What is the measurement level of the two variables "number of Nobel Prize winners" and "nation's chocolate consumption"?

Both are ratio.

Compute the correlation coefficient for the variables Drowning Deaths and Number of Cage Films. What is it?

0.67

Compute the correlation coefficient for the variables x1 and y1. What is it?

0.82

Compute the correlation coefficient for the variables x4 and y4. What is it?

0.82

Remove Barber from the data set and compute the correlation coefficient for the variables Javelin Distance and Hurdles Time. What is it?

< 0.001

Which of the following is the correct scatterplot of Javelin Distance on the vertical axis versus Hurdles Time on the horizontal axis?

i

Which of the following is the correct scatterplot of variable y1 on the vertical axis versus variable x1 on the horizontal axis?

ii

Which of the following is the correct scatterplot of Drowning Deaths on the vertical axis versus Number of Cage Films on the horizontal axis?

iii

Compute the correlation coefficient for the variables Javelin Distance and Hurdles Time. What is it?

-0.252

Put Barber back in the data set and remove Chouaa. Re-compute the correlation coefficient for the variables Javelin Distance and Hurdles Time. What is it?

-0.461