Listed below are time intervals (min) between eruptions of a geyser. Assume that the "recent" times are within the past few years, the "past" times are from around 20 years ago, and that the two samples are independent simple random samples selected from normally distributed populations. Do not assume that the population standard deviations are equal. Does it appear that the mean time interval has changed? Is the conclusion affected by whether the significance level is 0.10 or 0.01? Recent 79 90 88 79 56 101 63 86 71 89 82 82 57 80 73 102 62 Past 88 89 93 94 64 85 86 92 88 91 91 91 Let mu1 be the recent times and let mu2 be the past times. What are the null and alternative hypotheses? A. H0: mu1less thanmu2 H1: mu1equalsmu2 B. H0: mu1equalsmu2 H1: mu1greater thanmu2 C. H0: mu1not equalsmu2 H1: mu1equalsmu2 D. H0: mu1equalsmu2 H1: mu1not equalsmu2 Calculate the test statistic.