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Unformatted text preview: would happen if you wanted to approximate, say, P(X = 2)
= P(2 ≤ X ≤ 2).
Here are some binomial distributions with their normal approximations superimposed. 52 n = 15, p = 0.5 n = 30, p = 0.3 Example 7 Coin Flips
(a) If you flip a fair coin 100 times, what is the probability of getting more than 55 heads or
fewer than 45 heads?
(b)
What number of heads (out of 100) would make you suspect that the coin is not
fair?
Solution
(a) We are asking for
P(X<45 or X>55) = 1  P(45 ≤ X ≤ 55).
We co...
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This note was uploaded on 01/28/2014 for the course STATISTICS 1010 taught by Professor Herbret during the Spring '13 term at Tulane.
 Spring '13
 Herbret
 Statistics

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