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Florian Mettetal
Stat25203
S. Rein
HW #3 10:43,45,49,50
10.43
Twosample T for After vs Before
N
Mean
StDev
SE Mean
After
12
48.17
2.12
0.61
Before
12
45.33
2.46
0.71
Difference = mu (After)  mu (Before)
Estimate for difference:
2.833
95% CI for difference:
(0.881, 4.786)
TTest of difference = 0 (vs not =): TValue = 3.02
PValue = 0.007
DF = 21
With a significance value of 0.05, and a Pvalue of 0.007 we must reject the null hypothesis that the work
output of the production outline has not changed since the line being modified.
10.45
Paired T for MPG:AA  MPG: NA
N
Mean
StDev
SE Mean
MPG:AA
10
22.44
4.83
1.53
MPG: NA
10
21.91
5.32
1.68
Difference
10
0.530
1.011
0.320
95% CI for mean difference: (0.193, 1.253)
TTest of mean difference = 0 (vs not = 0): TValue = 1.66
PValue = 0.132
a.
The same drivers and same cars were necessary to see if the acetone improved the avg
MPG of any car. Different styles of driving and different cars effect the MPG and
creating these variables to the study would have significantly reduced the possibility for
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 Spring '05
 staff
 Statistics

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