STAT. TECH. FOR BUSINESS AND ECO (LL)
STAT. TECH. FOR BUSINESS AND ECO (LL)
18th Edition
ISBN: 9781265679637
Author: Lind
Publisher: MCG
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Chapter 12, Problem 30CE

a.

To determine

Find whether there is a difference in the mean flight times among the three airlines.

b.

To determine

Find the 95% confidence interval for the difference in the means between Airlines G and C.

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Please could you explain why 0.5 was added to each upper limpit of the intervals.Thanks
28. (a) Under what conditions do we say that two random variables X and Y are independent? (b) Demonstrate that if X and Y are independent, then it follows that E(XY) = E(X)E(Y); (e) Show by a counter example that the converse of (ii) is not necessarily true.
1. Let X and Y be random variables and suppose that A = F. Prove that Z XI(A)+YI(A) is a random variable.

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STAT. TECH. FOR BUSINESS AND ECO (LL)

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