20-review-1

# 20-review-1 - Stat 20 answers to special review questions...

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Unformatted text preview: Stat 20: answers to special review questions Michael Lugo September 27, 2010 Here are brief answers to the “special review questions” at the ends of Chapters 6 and 15 of FPP. Chapter 6 1. False - not all distributions are normal. 2(a). All the numbers are the same. (Consider, for example, (2 , 2 , 2).) 2(b). All the numbers are zero. 3. From the two numbers for which we can see both the original and standardized versions, we find that the SD is 15 and the mean is 52. So the filled-in table is 52 72-31 1.33-1.4 4(a). 87%. 4(b). 560. 5. Possibly a recording error. Possibly a gender change. 6(a). (600 × 500 + 650 × 500) / 1000 = 625. (b) Greater than 125. 7(a). (600 × 400 + 650 × 600) / 1000 = 630. (b) Greater than 125. 8. (ignore - we didn’t talk about measurement error). 9. mean is 3.6, SD is 2.0. (The number wrong is 10 minus the number right.) 10. False. This could also show that left-handedness has become more common over time. (This is the more likely explanation, as it’s less common to force children to be right-handed now than it was in the past.) 11. 67.5 inches....
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20-review-1 - Stat 20 answers to special review questions...

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