Question

A sample of 10 diesel trucks were run both hot and cold to estimate the difference in fuel economy. The results, in mpg, are presented in the following table.

Truck	Hot	Cold
1	4.55	4.26
2	4.46	4.08
3	6.49	5.83
4	5.37	4.96
5	6.25	5.87
6	5.90	5.32
7	4.12	3.92
8	3.85	3.69
9	4.15	3.74
10	4.69	4.19

Let μXμX represent the population mean for hot engines and let μYμY  represent the population mean for cold engines. Find a 98% confidence interval for the difference μD=μX−μYμD=μX−μY . Round the answers to three decimal places.

The 98% confidence interval is

Answer 1

TOPIC:Confidence interval for the difference between two means.