Errors correlation

• Jul 30th 2007, 02:03 PM
princess_anna57
Errors correlation
The following statements all contain errors. Identify and explain the error(s) in each case:
a) There is a moderately weak correlation of r = 0.3 between men's and women's wages in New Zealand.
b) The correlation between Nick Willis' times for the 1500m and 3000m is a strong r = 1.21
c) There is an extremely weak correlation of r = -0.94 between the duration of dementia with the degree of cognitive functioning.
• Jul 30th 2007, 02:06 PM
topsquark
Quote:

Originally Posted by princess_anna57
The following statements all contain errors. Identify and explain the error(s) in each case:
a) There is a moderately weak correlation of r = 0.3 between men's and women's wages in New Zealand.

r = 0.3 is very weak.

Quote:

Originally Posted by princess_anna57
b) The correlation between Nick Willis' times for the 1500m and 3000m is a strong r = 1.21

-0.999999... < r < 0.9999999...

Quote:

Originally Posted by princess_anna57
c) There is an extremely weak correlation of r = -0.94 between the duration of dementia with the degree of cognitive functioning.

r = -0.94 is (at least) a fairly strong correlation (probably categorized as very strong.)

-Dan