Use thet

-distribution to find a confidence interval for a difference in means

1

-

2

given the relevant sample results. Give the best estimate for

1

-

2

, the margin of error, and the confidence interval. Assume the results come from random samples from populations that are approximately normally distributed.

A95%

confidence interval for

1

-

2

using the sample resultsx

1

=

543

,s

1

=

109

,n

1

=

360

andx

2

=

434

,s

2

=

86

,n

2

=

200

Enter the exact answer for the best estimate and round your answers for the margin of error and the confidence interval to two decimal places.

Best estimate=

Margin of error=

Confidence interval :

to