P Value Formula 2 Sample T Test. In both cases p value is greater than the alpha value i e 0 05. The degrees of freedom df depend upon the variance assumption.
The degrees of freedom df depend upon the variance assumption. The formula for the test statistic is. P value with a one tail test is 0 078043 and p value with the two tail tests is 0 156086.
P value with a one tail test is 0 078043 and p value with the two tail tests is 0 156086.
For example how do we get 0 5098 from 2 x p t 0 6595. Because the p value is less than 0 0001 which is less than the significance level of 0 05 the decision is to reject the null hypothesis and conclude that the ratings of the hospitals are different. P value 2 2 cdf t d t score however the cdf of the t distribution is given by a somewhat complicated formula. The calculation for the p value depends on the alternative hypothesis.
