Confidence interval for population mean penetration depth

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Reference no: EM131431414

Manufacturing and Product Development

A 0.2-kiloton "bunker buster" missile is designed to destroy enemy bunkers approximately 70 feet deep. To prevent fallout, the missile must penetrate 120 feet below the ground. In tests conducted by the military, eight missiles were fired and the penetration depth (in feet) of each was recorded. The data are given in the table below.

122

117

119

121

124

119

120

a. Assume normality. Find a 99% confidence interval for the population mean penetration depth.

b. Is there any evidence to suggest the population mean penetration depth is less than 120 feet?

Reference no: EM131431414

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