An operations manager wants to know whether the maintenance of a filling machine for 2 litre milk bottles has made a difference in the average fill of the milk bottle. She randomly selects 25 bottles before the maintenance service, and 25 bottles after the maintenance service has taken place. The resulting SPSS output is shown below: Paired Samples Statistics Mean N Std. Deviation Std. Error Mean Pair 1 After Service 2.0029 25 .01142 .00228 Before service 1.9687 25 .03193 .00639 Paired Samples Test Paired Differences t df Sig. (2- tailed) Mean Std. Deviation Std. Error Mean 95% Confidence Interval of the Difference Lower Upper Pair 1 After Service – Before service .03420 .03503 .00701 .01974 .04866 4.882 24 .000 Question: Based on the output choose the most accurate answer
An operations manager wants to know whether the maintenance of a filling machine for 2 litre milk bottles has made a difference in the average fill of the milk bottle. She randomly selects 25 bottles before the maintenance service, and 25 bottles after the maintenance service has taken place.
The resulting SPSS output is shown below:
Paired Samples Statistics
|
|
Mean |
N |
Std. Deviation |
Std. Error Mean |
|
|
Pair 1 |
After Service |
2.0029 |
25 |
.01142 |
.00228 |
|
|
Before service |
1.9687 |
25 |
.03193 |
.00639 |
Paired Samples Test
|
|
Paired Differences |
t |
df |
Sig. (2- tailed) |
|||||
|
Mean |
Std. Deviation |
Std. Error Mean |
95% Confidence Interval of the Difference |
||||||
|
Lower |
Upper |
||||||||
|
Pair 1 |
After Service – Before service |
.03420 |
.03503 |
.00701 |
.01974 |
.04866 |
4.882 |
24 |
.000 |
Question: Based on the output choose the most accurate answer
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