Unformatted text preview: The SD is 0.5, either from the box 1 or from √ . 53 × . 47. The SE of the number is √ 400 × . 5 = 10. The SE of the percentage is 10 / 400 × 100% = 2 . 5%. The score is z = (5350) / 2 . 5 = 1 . 2. You can also do z = (212200) / 10 = 1 . 2. The Pvalue is 12%. This is not signiﬁcant. We put the diﬀerence down to chance variation. (b) How does your answer change if instead it had landed tails 212 times? It doesn’t. Heads and tails are interchangeable in this problem under the assumption that the coin is fair! 1...
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 Spring '11
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 Math, Statistics, Null hypothesis, Coin, Recitation section, points maximum, expected percentage, Math 127B

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