Using an independentmeasures t the 90 confidence interval fo

Using an independent-measures t, the 90% confidence interval for the difference between two population means ranges from 19 to 23. Based on this confidence interval, how big is the difference between the two sample means?

21 points

4 points

19 points

23 points

Solution

(b) 4 points

The difference will be given by 23-19=4. Hence option b is correct.