00:02
For the first part, we have to fill in the missing observed cell counts.
00:06
So we have age 20 to 34, age 35 to 49, age 50 to 64, and we have our marginal total.
00:21
And then we have cell phone user, non -cell phone user, and we have marginal totals.
00:47
Okay, so we've got 270 and 65, 151, 62, 31, and 145.
00:57
We need to find all of the marginal column totals.
01:07
And so here we go.
01:10
The first row we can find the cell phone user marginal total by adding 270 plus 151 plus 62, and that's 483.
01:20
Which gives a grand total if we add 145 to that of 628.
01:29
Then the h -50 to 64 column adds up to 93.
01:35
The 270 plus 65 adds up to 335.
01:43
And then if we take the grand total of 628, we can subtract the 93 and the 335...