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20 A new cell phone battery is being considered as a replacement for the current one.

10.20 A new cell phone battery is being considered as a replacement for the current one. Ten college
student cell phone users are selected to try each battery in their usual mix of “talk” and “standby”
and to record the number of hours until recharge was needed.
(a) Do these results show that the new battery has significantly longer life at α = .05? State your hypotheses and show all steps clearly.
 (b) Is the decision close?
(c) What is the mean and standard error?
45
41
53
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49
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old baterry
52
34
40
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44
34
45
28
33

This question was asked on May 02, 2010.

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