Researchers determined that 60 tissues is the mean number of tissues used during a cold. Suppose a random sample of 100 Kleenex users yielded that the mean number of tissues used during a cold is 52 and the sample standard deviation is 22. Suppose the test statistic does fall in the rejection region at 0.05 significance level. a. Which of the following conclusions is correct? a. there is sufficient evidence to conclude that the mean number of tissues used during a cold is different from 60 tissues. b. there is sufficient evidence to conclude that the mean number of tissues used during a cold is 60 tissues. c. there is not sufficient evidence to conclude that the mean number of tissues used during a cold is 60 tissues d. there is insufficient evidence to conclude that the mean number of tissues used during a cold is different from 60 tissues