Summary of Confidence Interval and Hypothesis Testing Formula
Setting
Estimate
Standard Error
Confidence Interval
Test Statistic
Population Mean
known
unknown
SE =
=
SE
0
SE
0
=
SE
SE
=
2
, SE
2
Difference Between
Population Means
1 and 2 known
1

IE 5317: Descriptive Statistics
The following data set refers to the tonnage (in
thousands of tons) for a sample of large oil tankers.
These numbers were taken from the 1976
International Petroleum Encyclopedia:
229
231
274
189
222
232
229
230
290
290
239