Question

An article reports that in a sample of 123 hip surgeries of a certain type, the...

An article reports that in a sample of 123 hip surgeries of a certain type, the average surgery time was 136.9 minutes with a standard deviation of 22.9 minutes.

(A) Find a 98% lower confidence bound for the mean time. Round the answer to two decimal places.

The 98% lower confidence bound is:

(B) Someone says that the mean time is greater than 134.26 minutes. With what level of confidence can this statement be made? Express the answer as a percent and round to two decimal places

The level of confidence is: %

Math   Statistics-And-Probability   
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