Listed below are time intervals(min) between eruptions of a geyser. Assume that the"recent" times are within the past fewyears, the"past" times are from around 20 yearsago, 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 haschanged? Is the conclusion affected by whether the significance level is 0.10 or 0.01? Find test statistic, p value, and conclusion

Recent

78

90

89

79

58

100

61

86

71

89

83

83

57

80

74

101

60

Past

90

87

93

94

65

84

86

92

86

91

88

91