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Ex1.4

# Ex1.4 - 6 ii No(b i 5 ii 83 6 13(a 0.08(b Yes it’s...

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Exercise 1.4 1. (a), 0.5; (b), 0.4; (c), 1; (d), 0; (e), A and B; 3. (a), 1 3 ; (b), 2 11 ; (c), 1 11 5. (a), 0.58; (b), Incorrect Favorable Unfavorable Men 0.42 0.38 0.2 Women 0.42 0.38 0.2 There is no gender differences. 7. (a), 43 . 99%; (b), 74 . 54%; (c), No, there are not independent. 9. The test is not useful because the event { High aptitude } and event { Good sales } are statistically independent. 11. (a), i), 86
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Unformatted text preview: . 6%; ii), No; (b), i), 5%; ii), 83 . 6%; 13. (a), 0.08; (b), Yes, it’s reasonable to assume independence. 15. We know of no reason why telephone orders should be either more likely or less likely to lead to returns than other types of orders. So it’s plausible that the events are independent, and hence the 4% ﬁgure. 1...
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