Give a 99.8% confidence interval, for

1

2

1-2

given the following information.

n

1

=

40

n1=40

,

x

1

=

2.31

x1=2.31

,s

1

=

0.79

s1=0.79

n

2

=

45

n2=45

,

x

2

=

1.89

x2=1.89

,s

2

=

0.64

s2=0.64

(,

,

) Round to 2 decimal places