<PRE><B>Question 1102721</B>
CI is mean +/- t (df, value)*s/sqrt(n)
for the first, it is 31 +/- t(df=31,0.95)*4/sqrt(31)
This is 31 +/- (1.70*4/sqrt(31))
That is 31+/-1.22
(29.78, 32.22) burglaries
=======================
second is done same way
CI is 8.6 +/-2.093*1.6/sqrt(20)
=8.6+/-0.75
(7.85, 9.35) speed in mph

</PRE>