Suppose that the paired data came from population that is normally distributed. Using 0.05 significance level determine the mean value of the differences d for the paired sample data, the standard deviation of the differences d for paried sample data, the t test statistic, and critical values to test the claim that μd=0.
xi 5,4,8,7,10,6,6,12
yi 6,5,6,10,6,11,5,8