00:01
Let's consider this true -false question.
00:04
We have values calculated from group data or estimates of the corresponding actual values.
00:10
Let's think about that for a minute.
00:13
If i have group data, let's just look at an example.
00:17
Let's say i have a group from 1 to 5, and then 6 to 11, and then 12 to 18.
00:31
In this particular case, we know that there's going to be 3 items here, and 2 items here, and 5 items here.
00:37
Well, if i want to find the mean of this, then what i'm going to have to do is average the 1 and 5 to get a value of 2, average the 11 and the 6 to get an average of 3, and then average the 11 and the 6 to get an average of 8 .5, and then we'd average the 12 and the 18 to get an average of 15...