Solution Since the problem is asking for a C. I. about u and o is given, we use
formula 1.
ELE
BRE
be
-Za12
8
RE
N
IOA
Net
Il
LEADER
THESE
SULES
SERE
BERY
SESUAI
TER
1. Find the standard error SE= 2a/2 J. In Gnumeric (cell Al) type in
=-normsinv (0.05/2) *5/sqrt(30).
2. In cell A2, type in=104-A1 for the left side of the interval.
3. In cell A3, type in =104+A1 for the right side of the interval.
4. Write the interval. Round off to the decimal place that is given for i.