Question

A study compares the rates of growth of vegetation at four swampy undeveloped sites using leaf lengths of a particular species. The table below summarizes the information.

Location	Sample size	Mean (?¯?x¯i)	Std. Dev (??si)
1	6	6.12	0.235
2	6	5.75	0.349
3	6	5.45	0.404
4	6	3.7	0.287

Note that the pooled standard deviation (?) is 0.325.

a) What is the 90% confidence interval for location 1?

b) What is the 95% confidence interval for location 2?

c) What is the 99% confidence interval for the difference between location 3 and location 4?

Answer 1