10. A marketing consultant was interested in estimating the mean weekly consumption of soft drinks
among teenagers. A random sample of
teenagers were asked how many ounces of soft drink they
'"
consume daily. The sum of the observations and the sum of the squared observations are shown below.
1
and
2,150
!
!
3œ"
3œ"
'"
'"
3
3
#
B œ
$'&
B
œ $
Estimate with 99% confidence the mean daily consumption of soft drinks by teenagers. Recall:
=
œ
B
"
8 "
8
B
#
#
3
3
#
Î
Ñ
Ð
Ó
Ð
Ó
Ð
Ó
Ð
Ó
Ï
Ò
"
Œ
!
11. Suppose that 9 observations are drawn from a normal population with
= 2.
The observations are:
5