Laptop Batteries Narrative
A computer laboratory manager was in charge of purchasing new battery packs for her lab of laptop computers. She narrowed her choices to two models that were available for her machines. Since the two models cost about the same, she was interested in determining whether there was a difference in the average time the battery packs would function before needing to be recharged. She took two independent random samples and computed the following summary information: 
-Refer to Laptop Batteries Narrative. Find a 95% confidence interval for the difference in average functioning time before recharging in the two models.
Definitions:
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