Question

The data show the heights in feet of waterfalls in Europe and in Asia. Find the 90% confidence for the difference of the means. Source: World Almanac. Round the answers to one decimal places. 487 900 1246 Europe 345 1385 984 1137 350 722 Asia 722 964 1904 Download data Use M, for the mean height of waterfalls in Europe. Assume the variables are normally distributed and the variances are unequal. <M-H₂< <

Answer 1

1.-577.1 < m1 - m2 < 426.4

Group 1	Group 2
891.17	966.50	mean
409.91	530.59	std. dev.
6	6	n
	9	df
	-75.333	difference (Group 1 - Group 2)
	273.724	standard error of difference
	-577.1	confidence interval 90.% lower
	426.4	confidence interval 90.% upper
	501.8	margin of error

2. -1.9 < m1 - m2 < 6.1

Group 1	Group 2
17.41	15.30	mean
2.45	3.77	std. dev.
17	10	n
	13	df
	2.112	difference (Group 1 - Group 2)
	1.333	standard error of difference
	-1.9	confidence interval 99.% lower
	6.1	confidence interval 99.% upper
	4.015	margin of error

3. 2446.91 < m1 - m2 < 13113.37

Group 1	Group 2
16,794.14	9,014.00	mean
3,582.03	2,987.60	std. dev.
7	8	n
	11	df
	7,780.143	difference (Group 1 - Group 2)
	1,717.181	standard error of difference
	2,446.91	confidence interval 99.% lower
	13,113.37	confidence interval 99.% upper
	5,333.231	margin of error

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