High School

The reserve capacities (in hours) of 18 randomly selected automotive batteries have a sample standard deviation of 0.25 hours. Use a 90% level of confidence to estimate the population variance and the population standard deviation. Assume the sample is from a normally distributed population.

Answer :

The class questioned a battery company's claim by calculating the probability of obtaining a certain sample mean. The evidence supported the class's doubts about the company's claim.

The subject of this question is Probability and Statistics.

The class questioned the battery company's claim by calculating the probability of getting a sample mean of 16.7 hours or less using the Central Limit Theorem.

Based on the given information, the class was justified in questioning the company's claim as the probability was found to be only 2%.

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