You you need to establish if there is any difference between the two sets then the null hypothesis is
and
The you require is the hypothesised difference so make in your test statistic.
Ok I have to do a 2 sample t-test so i have 2 different sets of data that are similar to this.
boy grades = 90,87,77,97,64,76,88,93,83,79
girl grades = 100,95,69,77,85,89,78,90,66,81
alpha = .05
If i take the average of each set, I can find the x-bar but i need to find the mu in order to complete the test statistic. Any help is appreciated, thanks
well someone needs to win some joke points away from Mr Fantasy
OK, back to YOUR question.
We need more information.
First of all, what are you trying to prove?
we need to know, what the alternative hypoethesis is.
Next we need to knw if this is a paired difference experiment, since we
have the same number of boys and girls.
But I doubt that it is a paired diff experiment.
Next we need to know if the population variances are equal or not.
They seem to be, if thats the case.
The test stat would be
where we are pooling the sample variances.
Then we need to know if this is a one-sided or two-sided test.
So, you need to tell me what they are asking you to prove
and the distribution under the null hypothesis would be a t with df
equal to the sum of the two sample sizes minus two.