Author Question: The principal at Riverside High School would like to estimate the mean length of time each day that ... (Read 72 times)

sarasara · **on:** Jul 24, 2018

The principal at Riverside High School would like to estimate the mean length of time each day that it takes all the buses to arrive and unload the students.

How large a sample is needed if the principal would like to assert with 90 confidence that the sample mean is off by, at most, 7 minutes. Assume that s = 14 minutes based on previous studies. A) 11 B) 10 C) 12 D) 13

Question 2

Given events C and D with probabilities P(C) = 0.3, P(D) = 0.2, and P(C and D) = 0.1, are C and D independent?

A) no B) yes C) cannot be determined