7 Suppose a sample of 13 paired differences that has been randomly selected from a normally distributed population of paired differences yields a sample mean of 104 and a sample standard deviation of 5. a Calculate 95 percent and 99 percent confidence intervals for μd=μ1−μ2. b Test the null hypothesis H0::μd≤100 versus Ha:μd>100 by setting α equal to .05 and .01. How much evidence is there that μd=μ1−μ2 exceeds 100 ?