Question

please answer as soon as possible

Consider the following results for two independent random samples taken from two populations. Sample 1 Sample 2 1 13.2 11.3 σί 2.1 σ2-3 What is the point estimate of the difference between the two population means? (to 1 decimal) 2 Provide a 90% confidence interval for the difference between the two population means (to 2 decimals) 98 3.02 Provide a 95% confidence interval for the difference between the two population means (to 2 decimals). 2.76 1.24

Answer 1

1.

The point estimate of μ1−μ2 is

x1¯−x2¯=13.2-11.3

= 1.9

2.

χα/2

2 2 ni n2 2.121 + 30, 13.2-11.3 + 1.96V V 5030 1.2 11.3 +1.96 0 (0.679, 3.121) =

(0.68, 3.12)

(c)

n1 n2 n1 n2 (as 2.12 3 + 2.241 + 13.2-11.3 , ה 50 30 13.2- 11.3-2.241 50 30 (0.503, 3.297)

(0.50,3.30)