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.

Recent	75	87	90	79	59	102	64	90	68	87	83	82
Past	92	86	101	97	68	85	84	92	84	99	93	99

null and alternative hypotheses

test statistic

p value