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 91 89 78 58 99 62 88 69 89 83 84 55 81 75 102 61 Past 90 89 93 94 64 86 84 92 86 91 89 91 Let u, be the recent times and let J2 be the past times. What are the null and alternative hypotheses? O A. Ho: H1 = H2 OB. Ho- H1 = H2 Hy : H 1 # H2 H , : H 1 > H2 O C. Ho- H, # H2 OD. Ho My