A company provides portable walkie-talkies to construction crews. Their batteries last, onaverage, 55 hours of continuous use. The purchasing manager receives a brochureadvertising a new brand of batteries with a lower price, but suspects that the lifetime of thebatteries may be shorter than the brand currently in use. To test this, 8 randomly selectednew brand batteries are installed in the same model radio. Here are the results for thelifetime of the batteries (in hours):
Is there sufficient evidence to conclude that the purchasing manager is correct in hisconjecture that the new brand has a shorter average lifetime?

Question

A company provides portable walkie-talkies to construction crews. Their batteries last, onaverage, 55 hours of continuous use. The purchasing manager receives a brochureadvertising a new brand of batteries with a lower price, but suspects that the lifetime of thebatteries may be shorter than the brand currently in use. To test this, 8 randomly selectednew brand batteries are installed in the same model radio. Here are the results for thelifetime of the batteries (in hours): 
 Is there sufficient evidence to conclude that the purchasing manager is correct in hisconjecture that the new brand has a shorter average lifetime?

Quizplus · Accepted Answer

The Answer of A company provides portable walkie-talkies to construction crews. Their batteries last, onaverage, 55 hours of continuous use. The purchasing manager receives a brochureadvertising a new brand of batteries with a lower price, but suspects that the lifetime of thebatteries may be shorter than the brand currently in use. To test this, 8 randomly selectednew brand batteries are installed in the same model radio. Here are the results for thelifetime of the batteries (in hours): 
 Is there sufficient evidence to conclude that the purchasing manager is correct in hisconjecture that the new brand has a shorter average lifetime?

A Company Provides Portable Walkie-Talkies to Construction Crews