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 78 90 88 79 57 99 61 87 71 87 81 82 56 81 73 103 62 Past 90 88 93 94 63 86 86 92 88 91 90 91 Let u, be the recent times and let u, be the past times. What are the null and alternative hypotheses? O A. Ho: H1= H2 H: H> H2 O B. Ho: H1= H2 H H1 H2 O C. Ho: H1

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