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 77 90 88 80 58 100 61 87 69 87 82 83 56 82 75 101 61 5 Past 89 89 93 94 63 84 84 92 87 91 90 91 Let u, be the recent times and let u2 be the past times. What are the null and alternative hypotheses? O A. Ho: My = H2 OB. Ho: H1 = H2 Hy : Hy > H2 O C. Ho- Hy