Efficiency experts study the processes used to manufacture items in order to mak

Question

Efficiency experts study the processes used to manufacture items in order to make them as efficient as possible. One of the steps used to manufacture a metal clamp involves the drilling of three holes. In a sample of 74 clamps, the mean time to complete this step was 53.6 seconds. Assume that the population standard deviation is 6 seconds. What is the lower bound of the 98% confidence interval? (for example: 41.9). Write only a number as your answer. A college admissions officer takes a simple random sample of 105 entering freshmen and computes their mean mathematics SAT score to be 440. Assume the population standard deviation is 116. What is the lower bound of the 99% confidence interval? Round your answer to the nearest integer. Write only a number as your answer.

Explanation / Answer

using statdisk13

question 5)

Margin of error, E = 1.658987

98% Confident the population mean is within the range:
51.94101 < mean <55.25899

lower bound=51.9

question 6)

Margin of error, E = 29.15949

99% Confident the population mean is within the range:
410.8405 < mean <469.1595

lower bound =411

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