An team of engineers is preparing a report on the battery
lifetime of a new cell phone battery they have designed. At a 95%
confidence level, they estimated that their battery's mean lifetime
was 3.2 ±1.0 days based on a sample of 30. They want to adjust
their findings so the margin of error is as small as
possible.
Which of the following will produce a lower margin of error?
1. Increase the confidence level to 99%.
2. Increase the sample size to 60 batteries.
3. Decrease the sample size to 25 batteries.
4. Decrease the confidence level to 90%.
A. 1, 2 and 3
B. 1 and 3
C. 2 and 4
D. 4 only
E. 1, 2, 3 and 4
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