In a manufacturing process, a random sample of 36 manufactured bolts has a mean length of 3 inches with a standard deviation of .3 inches. What is the 99 percent confidence interval for the true mean length of the manufactured bolt?
A) 2.902 to 3.098
B) 2.884 to 3.117
C) 2.864 to 3.136
D) 2.228 to 3.772
E) 2.802 to 3.198

Question

Quizplus · Accepted Answer

[± ] = [3 ± 2.719 (.3/6)] = [3 ± .136] = [2.864, 3.136]

In a Manufacturing Process, a Random Sample of 36 Manufactured