The following results come from two independent random samples taken of two populations.

Sample 1 Sample 2

n₁= 40 n₂ = 35

x₁ = 13.3 x₂ = 11.8

₁ = 2.3 ₂ = 3.1

1. What is the point estimate of the difference between the two population means? (to 1 decimal)

______________

1. Provide a90%confidence interval for the difference between the two population means (to 2 decimals).

(___________ , _____________)

1. Provide a95%confidence interval for the difference between the two population means (to 2 decimals).

(___________ , _____________)