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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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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