Review 3 Flashcards
What are the levels of measurement?
Nominal (lowest)
Ordinal
Interval
Ratio (highest)
Which levels of measurement is this?
Lowest level
-data only fits into one category
-data cannot be rank ordered
Nominal
(Gender, ethnicity, marital status, medical diagnosis)
Which levels of measurement is this?
-data cannot be rank ordered
-data is mutually exclusive and exhaustive
-each category is evaluated against each other, exact variable between are not known
Ordinal
E.g. pain scale
Which levels of measurement is this?
Distance between intervals of scale are numerically equal
No absolute zero point
Interval
E.g., temperature scale
Which levels of measurement is this?
-distance between intervals are numerically equal
-has an absolute zero
Ratio
(Weight, height, BP, lab values)
Random sampling with a equal chance for inclusion is what type of sampling method
Probability
Term:
Capacity to correctly reject the null hypothesis and avoid a Type 2 error (false negative)
Power
What type of result is this?
Truth: yes
and
Test: yes
True positive
What type of result is this?
Truth: no
and
Test: yes
False positive (type 1 error)
What type of result is this?
Truth: yes
and
Test: no
False negative: type 2 error
What type of result is this?
Truth: no
and
Test: no
True negative
Term:
Refers to the quality
-steps to make the study trustworthy
Rigour
Term:
Indicates you’ll get the same result every time
Reliability or reproducibility
in statistics refers to consistency in measurement
Two types of Reliability
Homogeneity
Stability
What is Homogeneity?
The internal consistency (reliability)
- tests the extent all items (instruments) consistently measure a variable
What is Stability?
-test-retest reliability
Consistency of repeated measures of the same variables with the same scale over time.
Term:
Accurately measures as intended
Validity
(Evaluation is based on measurements)
Convergent- focuses on similarities
Divergent- focuses on differences
Term:
Number characterizing a sample
Roman letter used
Statistic
Standard for sample statistic= s
Term:
Number characterizing a population
Greek letter used
Parameter
Three measurements of central tendency
Mode
Median
Mean
Term:
Value that occurs with the greatest frequency
Hint: May be bimode or multimodal
Mode
*only acceptable measure of central tendency
