Question

1.   All of the following are characteristics of the standard deviation except?
    A.   The lower the standard deviation, the more similar the observations in the dataset.
    B.   Is a measure of the spread of a dataset
    C.   Is robust to outliers
    D.   Is always positive
    E.   Is the square root of the sample variance

2.   Two events are mutually exclusive if
    A.   They are not independent
    B.   Their union equals zero
    C.   All of the above
    D.   They always happen together
    E.   Their intersection equals zero

3.   The sample median...
    A.   All of the above
    B.   is fairly robust to extreme values
    C.   is usually smaller than the 25th percentile
    D.   is always larger than the sample mean if the data are skewed

4.   The Central Limit Theorem:
    A.   Describes the distribution of sample means
    B.   Is applied when calculating PPV based on Sensitivity / Specificity
    C.   Is not very powerful or useful.
    D.   Doesn’t apply for skewed populations, even when the sample size is large
    E.   All are correct

5.   The limitations of case series include all of the following except
    A.   They only apply to the group in question
    B.   They may be used to provide clues to new exposures
    C.   They lack a comparison group
    D.   There is no way to establish a cause-effect relationship

Answer 1

1.   All of the following are characteristics of the standard deviation except?

Correct answer is "C.   Is robust to outliers"

2.   Two events are mutually exclusive if

Correct answer is "E.   Their intersection equals zero"

3.   The sample median...
Correct answer is " B.   is fairly robust to extreme values"

4.   The Central Limit Theorem:
Correct answer is " A.   Describes the distribution of sample means"

5.   The limitations of case series include all of the following except
Correct answer is " D.   There is no way to establish a cause-effect relationship"

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