00:01
For this problem, we are told to refer to the international journal of obesity study of the physical activity of obese young adults presented in exercise 6 .37.
00:10
We're told that for two groups of young adults, 13 obese and 15 of normal weight, researchers recorded the total number of registered movements or counts of each young adult over a period of time.
00:22
We're told that baseline physical activity was then computed as the number of counts per minute.
00:27
Four years later, physical activity measurements were taken again, called physical activity at follow -up.
00:33
In part a, we are told that for the 13 obese young adults, the researchers reported a correlation of r -equals 0 .5 between baseline physical activity and follow -up physical activity, with an associated p value of 0 .07.
00:49
We are told to, or we are asked, to give a practical interpretation of this correlation coefficient and p -value.
00:55
So the interpretation would be the r value being greater than zero implies that there is positive correlation.
01:09
So increase in the original cpm would correspond to an increase in the follow -up cpm.
01:17
And the p value being equal to 0 .07 means that we can be up to 93 % confident in at least the sign or in the conclusion that r is greater than zero.
01:40
In part b, one moment here, i might need to go find the data set...