A researcher is studying happiness scores in senior citizens and calculated a sample mean of 7.33 from n = 25 participants. She wants to know if her sample mean differs from the United States population mean of 6.951 (with a standard deviation of 0.7). She plans to use an alpha level of .01 to conduct a two-tailed, one-sample z-test.Fail to reject the null, p < .01. Reject the null, p < .01 . Fail to reject the null, p > .01. Reject the null, p > .01