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
|
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?