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The capacities (in ampere-hours) were measured for a sample of 120 batteries. The average was 178...

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Basic Math

The capacities (in ampere-hours) were measured for a sample of120 batteries. The average was 178 and the standard deviation was12.

a.)

Find a95% lower confidence bound for the mean capacity of this type ofbattery. Round the answer to two decimal places.

b.)Anengineer claims that the mean capacity is greater than 175ampere-hours. With what level of confidence can this statement bemade? Express the answer as a percent and round to two decimalplaces.

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