00:01
Okay, so i see that you need help with this problem.
00:02
And the first thing that we have to do is we have to figure out what the 98 % confidence interval for the difference between the mean of the cell phone residents in europe and america is.
00:11
So fill in blank one, report the bounds.
00:15
Enter your answers as the lower bound, upper bound with no additional spaces rounding bounds to three decimal places.
00:21
So the first thing that you had to do is you had to find the mean of the europe.
00:26
And that is 108 .15.
00:30
And then the mean of the americas is 87 .23.
00:37
Then you had to find the standard deviation of europe, which is 29 .96.
00:44
The amount of numbers that there are is 41.
00:46
And then the standard deviation of the americas is 35 .12.
00:52
And the amount of numbers that there are is 39.
00:56
So then what you had to do is you had to find the pooled variance.
01:01
So you're going to take 41 minus 1, which is 40.
01:04
You're going to multiply that by the standard deviation of 29 .9 squared plus the 39 minus 1 is 38 times the standard deviation of 35 .12 squared.
01:18
Then you're going to divide that by 41 plus 39 minus 2.
01:23
And you are going to get 1061 .2027.
01:30
And then the square root of that is going to be 32 .5761.
01:38
And then you're going to multiply that by 141 plus 1 over 39.
01:45
And that is going to equal 7 .2865.
01:50
Okay? so we're going to end up using that value.
01:53
And then i have to find the t -score.
01:56
So that's 1 minus 0 .98 equals 0 .02.
02:02
That is my p -value.
02:07
And so then i'm going to then take that 0 .02.
02:13
I'm going to do 1 minus 0 .02...