Biostatistics Test Three

Question 1

What is Nominal Data?

Answer 1

NO order or magnitude
NO consistency of scale
Dichotomous binary variables

Question 2

What is Ordinal data?

Answer 2

Ordered rank-able data, not equal distances.
Yes order or magnitude
No consistency of scale
3+ categories

Question 3

What is Interval data?

Answer 3

Yes consistency and equal scale
Yes order/magnitude
negative numbers possible

Question 4

What kind of skew occurs when the mean is higher than the median?

Answer 4

Positive skew

Question 5

What kind of skew occurs when the mean is lower than the median?

Answer 5

Negative skew

Question 6

Describe Kurtosis.

Answer 6

A measure of the extent of clusteredness around the mean
Normal: 0
Positive: more cluster
Negative: less cluster

Question 7

What is variance?

Answer 7

The average of the squared differences in each individual measurement value and the mean of the groups. How much each score varies.

Question 8

What is standard deviation?

Answer 8

Square root of the variable value