Thread: Engineering statistics help #2

Engineers are studying heat loss in waste water treatment clarifiers during winter season. A comparison test (measured in BTU/ sq-ft) on clear days in two cities was conducted in St. Joseph and Chicago. The results are listed in the chart below.
a) Establish a 95% CI for the mean heat transfer difference for the listed day long test data.
b) Interpret the results.

Date
St. Joseph
Chicago

Dec. 21
782
593
Jan 6
965
672
Jan 21
948
750
Feb 6
1181
988
Feb 21
1414
1226
Mar 7
1633
1462
Mar 21
1852
1698