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Data Hw 2

# Data Hw 2 - by the square root of 4 and got-1.15 and I...

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Matthew Harb 2/4/08 The conceptual difference between chapter and chapter 9 is that chapter 8 talks about random variables and their distributions. Chapter 9 talks about sampling distributions Central Theorem is a sampling distribution of mean from a random sample taken from any population is approximately normal for large sample size. Variance is standard deviation squared and it is nonnegative. Standard deviation is the measure for variability of data. Population is all of the items of interests Sample is a set of observations from the population 9.17 a. What I did was take 117-120/5.2 and got P(Z>-0.58) then I looked up .58 and found that it equals .2810 b. What I did was set it up the same way as I did in part a. except divided the standard deviation
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Unformatted text preview: by the square root of 4 and got -1.15 and I looked up the probability and got .3739 9.18 a. what I did for this question was take 52-60/6 and got -1.33 and I looked it up the probability and got .4082 b. for this one I set it up the same way as a. except divided the S.D. by the square root of 6 rather than just 6 and got -3.27 and I looked up the probability and got about .4994 9.21 a. What I did was 7-6/1.5 which gave me Z>.67 and the probability is .2514 b. For this I did the same thing as a. but divided 1.5 by the square root of 5 and got Z>1.49 and the probability is .0681 9.26 What I did was 300-288/78 but 78 is divided by the square root of 60 I to got z>1.19 which turns out to be .1170...
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