BUAL 2600 YAN EXAM 1 QUESTIONS WITH CORRECT ANSWERS

a number calculated using the sample measurements that describes some aspect of
the sample


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sample statistic




In ________ we select elements because they are easy to sample.
A) random sampling
B) convenience sampling
C) judgment sampling
D) probability sampling


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, B) convenience sampling




divide population into non-overlapping groups (strata) then select a random sample
from each strata


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stratified random sampling




-cheaper still
-same problems as mail surveys


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web surveys




A set of all elements about which we draw conclusions


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Population




sampling where we select elements because they are convenient to sample
not a probability sample

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convience sampling




(1-1/k^2)%


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Chebyshev's Theorem Formula




-inexpensive
-low response rate


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phone surveys




-Plot a point above each class midpoint at a height equal to the frequency of the class
-Useful when comparing two or more distributions


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frequency polygon




sample data: 8,7,5,2,9,2,5,5
a. whats the mean?