Question

The following results are for independent random samples taken from two populations.

Sample 1	Sample 2
n1 = 20	n2 = 30
x1 = 22.5	x2 = 20.1
s1 = 2.9	s2 = 4.6

a) What is the point estimate of the difference between the two population means? (Use

x₁ − x₂.)

b) What is the degrees of freedom for the t distribution? (Round your answer down to the nearest integer.)

c) At 95% confidence, what is the margin of error? (Round your answer to one decimal place.)

d)

What is the 95% confidence interval for the difference between the two population means? (Use

x₁ − x₂. (Round your answers to one decimal place.)

______to _______

Answer 1