00:01
All right, so we have a table here where we had x is the age of six patients and y is the blood pressure.
00:09
So what i did is i went ahead and put all of the x variables into one list in my calculator and all the y's into another list.
00:17
And then i ran a linear regression test.
00:20
Okay? so what i'm going to do is in part a, it says find the p value and the significance level.
00:30
Of alpha equals 0 .05 to 4 decimal places.
00:34
So i need to run a linear regression t test, which you can do once you have all of your data in your lists like this, right? so i run a linear regression t test on my calculator, excuse me, and when i did that, i got a p value of 0 .1 .55, which came from a t test statistic of 4 .05.
01:11
Okay, but you really want the p value, which means that this is significant at the alpha equals 0 .05 level, right? for b, it asks to use the critical value method attained from the table.
01:32
Okay, so if i look at the critical value method, basically, it's asking me to find the value of t such that the area in my two tails is equal to 0 .05, when added together, which means that each of them individually would be 0 .025.
01:54
So, i need to look on my t chart, basically, and with the correct degrees of freedom, which in this case is going to be n -minus 2.
02:04
So since i had six patients, it's going to be four degrees of freedom.
02:07
I need to find what the critical value is.
02:12
All right, so we have a table here where we have...
02:15
And when i look with four degrees of freedom on my chart and i look for the tail probability equal to 0 .25, i get 2 .776 and negative 2 .776 for the critical value there.
02:35
Okay, so there's the critical value for each of these for part b...