Before choosing a statistical test to compare a mean score between two groups, which of the following needs to be considered?

Select one:

a.

Distribution of the outcome measure

b.

Independence of groups being compared

c.

Sample size

d.

Parametric versus non parametric methods

e.

All of the above are correct.

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The intercept in a linear regression model is:

Select one:

a.

the difference between the observed and expected values

b.

the change in Y for a unit change of X

c.

the value of Y when x is zero

d.

none of the above

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The mean is less stable in skewed data than the median. State if true or false.

Select one:

True

False

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In a frequency distribution, the lowest score is 35 and the highest is 50; the mean is 17. The range is:

Select one:

a.

11

b.

15

c.

24

d.

33

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Linearity in relationships between two continuous variables is best spotted by a:

Select one:

a.

box plot diagram

b.

pie graph

c.

scatterplot

d.

none of the above

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To transform a raw score to a z score, you do not need the:

Select one:

a.

variance

b.

standard deviation

c.

mean

d.

median

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A positive predictive value of a test is 0.34; this means that:

Select one:

a.

34% of the time the measure tells us that there is a problem when there is none

b.

66% of the time the measure tells us that there is a problem when there is none

c.

66% of the time the measure tells us that there is no problem when there is none

d.

none of the above

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You want to compare the number of male and female patients by ethnic/racial groups. There are 20 different races. For the chi-square test, the number of degrees of freedom is:

Select one:

a.

19

b.

20

c.

21

d.

2

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Question 29

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Which of the following graphs can easily show variability and dispersion of involved observations?

Select one:

a.

Pie Chart

b.

Box Plot

c.

Line Graph

d.

Bar Plot

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Question 30

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A pharmaceutical company is aiming to compare the results of two drugs: A and B. Due to a mix up in preparations, drugs A and B end up being exactly the same BUT the statistical test shows

Select one:

a.

Type 2 error

b.

Type 1 error

c.

Low Power

d.

both b and c

e.

none of the above

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