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    Past 79    90 90    87 89    93 78    94 57    64 101    84 61    84 87    92 71    88 88    91 82    91 82    91 57 82 74 103 62   Calculate the test statistic.   t=enter your response here ​(Round to two decimal places as​ needed.)

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 condlusion affected by whether the significance level is 0.10 or 0.01? Recent 78 91 90 78 58 100 61 88 70 87 82 83 55 82 75 103 62 - Past 90 89 93 94 63 85 86 92 88 91 90 91 Let p, be the recent times and let u, be the past times. What are the null and alternative hypotheses? OB. H Hy * Hz H PP2 OC. H P