THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
A computer information systems manager was in charge of purchasing new battery packs for laptop computers.The choices were narrowed to two available models.Since the two models cost about the same,the manager was interested in determining whether there was a difference in the average time the battery packs would function before needing to be recharged.Based on two independent random samples,the following summary information was computed:

-Find a 90% confidence interval for the difference in average functioning time before recharging the two models.

Question

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
A computer information systems manager was in charge of purchasing new battery packs for laptop computers.The choices were narrowed to two available models.Since the two models cost about the same,the manager was interested in determining whether there was a difference in the average time the battery packs would function before needing to be recharged.Based on two independent random samples,the following summary information was computed:
 
-Find a 90% confidence interval for the difference in average functioning time before recharging the two models.

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The Answer of THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
A computer information systems manager was in charge of purchasing new battery packs for laptop computers.The choices were narrowed to two available models.Since the two models cost about the same,the manager was interested in determining whether there was a difference in the average time the battery packs would function before needing to be recharged.Based on two independent random samples,the following summary information was computed:
 
-Find a 90% confidence interval for the difference in average functioning time before recharging the two models.