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Listed below are time intervals​ (min) between eruptions of a geyser. The​ "recent" times are within...

Listed below are time intervals​ (min) between eruptions of a geyser. The​ "recent" times are within the past few​ years, and the​ "past" times are from 1995. Does it appear that the variation of the times between eruptions has​ changed? Use a 0.05 significance level. Assume that the two populations are normally distributed.

77 86
90 91
91 93
76 96
57 62
101 87
62 89
90 92
69 84
92 95
84 86
81 96

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