1) According to chebyshev\'s rule, at least what percent of the observations in
ID: 3126877 • Letter: 1
Question
1) According to chebyshev's rule, at least what percent of the observations in a sample are contained within 2 standard deviations around the mean regardless of the shape of the distribution? Would it be
67.0,
33.3,
75.0,
99.0
2) Which of the following reflect the need for statistical sampling?
A) it is too costly to deal with the entire population
B) it is too difficult or cumbersome to deal with the entire population
C) it is too time consuming to deal with the entire population
D) the analysis of the data may be destructive in nature
E) All of the above
Explanation / Answer
1.
According to chebyshev's rule, at least 75% of the observations in a sample are contained within 2 standard deviations around the mean regardless of the shape of the distribution.
2.
If the population is large for example we want make some inference about all U.S. adults (age 18 or above) then all its not possible to ask questions to each and every adult of U.S. In this case we need statictical sampling.
Option E is correct.
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