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Example
A consumer group is testing camp stoves. To test the heating capacity
of a stove they measure the time required to bring 2 qt of water from
50 q q q q q F to boiling (at sea level). Two competing models are under
consideration. 36 stoves of each model were tested and the following
results were obtained.
Model 1: mean time
Model 2: mean time
Is there any difference between the performances of these two
models? (Use a 5% level of significance.)
Procedure
1 m STAT2
2 3(TEST) b(Z)c(2-Smpl)
3 2(VAR) c
1(!) c
c.ew
dw
bb.fw
dgw
baw
dgw
1(None) c
4 1(CALC)
6(DRAW)
Result Screen
Since P = 0.01914957 < 0.05 (level of significance), we reject the null hypothesis
and conclude the performances of the two models are different.
5
examples
o o o o o
= 11.5min; standard deviation
1
o o o o o
= 10 min; standard deviation
2
"
= 2.4min
1
"
= 3 min
2
µ
1-
µ
2 =0
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