00:01
Hi, i'm david and i'm here to help you answer your question.
00:03
Now let me bring up your question here.
00:06
In the question here, we are going to discuss about the hypothesis testing.
00:10
Here i want to test the known hypothesis that the mean bully minus the mean bystander will equal to 0 versus the alternative hypothesis that the different will not equal to the 0.
00:24
Notice that this is a 2 -tel test.
00:32
And now we want to test this one and want to find the degree freedom and the first question here the degree freedom it will equal to the n1 plus n2 minus 2 so the n1 will equal to here the first group will equal to the 23 that will be the n1 plus the n2 will be the 28 minus 2 so we get equal to the 49 degree freedom.
01:06
And the next one asked you find the critical t score.
01:10
So we have the critical value will be plus and minus the t the degree freedom will be the 49.
01:17
And the unfa over 2 will be the 0 .025.
01:22
And to find this value i use the t distribution with the 49 degree freedom.
01:28
And the level 0 .0 .05.
01:32
Then we get equal to the 2 .0 .0.
01:33
Then we get equal to the 2 .0 0 to i round this one to the 3 decimal places will be the 2 .0 0 .10 and then the next one asked you to find in order to calculate the t we need to calculate this a boon variant first.
01:58
So the boon variance here the formula it will be sb square and n1 minus 1 times when the s1 square plus and 2 minus 1, time with the s2 square, divided by the n1 plus n2 minus 2...