Chapter 15 pwpt Flashcards
What is validity?
Is the measurement accurate?
What is reliability?
Is the measure consistent?
What is error variance?
Variability attributable to error
Observed score=?
True score + error
Observed test score could be either?
Chance or random error
Or
Systematic or constant error
Chance or random error is?
Errors difficult to control
Systematic or constant error is?
Measurement error that is attributable to relatively stable characteristics of the study sample that may bias their behavior and/or cause incorrect instrument calibration
What are the three major kinds of validity?
Content validity
Criterion related
Construct
What is content validity?
Representative of the concept?
Panel of experts to assess items
Content validity index= index of interrater agreement or relevance
Face validity= the appearance of measuring the construct/concept
Criterion related validity is?
Concurrent= degree of correlation between two measures
Predictive= degree of correlation between a measure and a future measure
Construct validity is?
Extent that test measures a theoretical construct, attribute or a trait
Examples of construct validity are?
Hypothesis testing approach, multi-trait multimethod, factor analytic approach
Major tests of reliability are?
Test-retest Parallel or alternate form Item-total correlation Split-half Kuder-Richardson (KR-20) Cronbach’s alpha Interrater reliability
A measure can be reliable but not _____?
Valid
A valid instrument, however, is ____________.
Reliable
Appraising the evidence of reliability and validity
How was the validity of the instrument determined?
Is the validity of the measurement tool adequate?
How was the reliability of the tool tested?
Is the reliability of the tool adequate?
What kinds of threats to internal or external validity are presented by weaknesses in reliability and/or validity?
Are strengths and weaknesses of the reliability and validity appropriately addressed in the “Discussion,” “Limitations,” or “Recommendations” sections of the report?
How do the reliability and validity affect the strength and quality of the evidence provided by the study findings?
Which of the following is addresses when data collection procedures stress the use of the same technique each time a blood pressure is obtained in a nursing study on the effect of pain management on blood pressure?
Interrater reliability
What is the most common test for internal consistency (reliability) of an instrument measuring a concept such as self efficacy?
Cronbach’s alpha
