Question

Consider the following results for two independent random samples taken from two populations.

Sample 1	Sample 2
n 1 = 40	n 2 = 30
x 1 = 13.4	x 2 = 11.9
σ 1 = 2.3	σ 2 = 3.2

1. 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). Use z-table.
   ( , )
3. Provide a 95% confidence interval for the difference between the two population means (to 2 decimals). Use z-table. If your answer is negative, enter minus (-) sign.
   ( , )

Answer 1

Part a)

Part b)

Confidence interval :-

Lower Limit =
Lower Limit = 0.3681
Upper Limit =
Upper Limit = 2.6319
Confidence interval is ( 0.37 , 2.63 )

Part c)

Confidence interval :-



Lower Limit =
Lower Limit = 0.1512
Upper Limit =
Upper Limit = 2.8488
Confidence interval is ( 0.15 , 2.85 )