Flashcards in Stats Deck (96)
When is a MANOVA used
With one or more independent variables and two or more dependent variables
Between subjects versus Within subjects designs
Between-subjects (or between-groups) study design: different people test each condition, so that each person is only exposed to a single user interface.
Within-subjects (or repeated-measures) study design: the same person tests all the conditions (i.e., all the user interfaces).
MIXED study design utilizes both BETWEEN GROUPS subjects AND WITHIN GROUPS variables
SEM Standard Error of Measurement in creating Confidence Intervals
68% confidence interval is the score given + or - the SEM
95% confidence interval is the given score + or - TWICE (x 1.96) the SEM
99% confidence is the given score + or - 2 1/2 times SEM (x 2.58)
A test developer is calculating a test's _____ when dividing the number of true positives ID by the test by the number of true positives PLUS false negatives
The WAIS-IV’s Global Ability Index (GAI) is based on subtests for which of the following Indexes?
Verbal Comprehension and Perceptual Reasoning
Taylor-Russell Tables provide an estimate of the incremental validity of a test.
The greatest validity comes with a selection ratio of __ and a base rate of __.
Need BASE RATE, SELECTION RATIO, and VALIDITY COEFFICIENT
What happens to the SEM when sample size increases?
- SEM decreases as sample size increases.
Occurs when for 2 groups (ie men /women):
Criterion-related Validity is SAME
Criterion scores are SAME/SIMILAR, but
Predictor Scores are significantly DIFFERENT
Rancho Los Amigos Level of Cognitive Functioning Scale
A patient who receives a rating of Level V (Confused – Inappropriate Response) is confused but non-agitated, responds to simple commands, gives random or fragmented responses to complex stimuli, has impaired memory and selective attention, and is unable to retain new information.
Co-efficient of stability
Measures reliability of test across 2 occasions with separate examinees
Co-efficiency of Internal Consistency
Measures the reliability of a factor that fluctuates in intensity or severity over time
Test Bias: What does Slope Bias describe?
When a predictor's validity co-efficient differs for different groups
Wonderlic Personelle Test - R evaluates what?
A brief test of mental ability for adults.
Solomon 4 Group Design
Evaluates the effects of pre-testing
SAT Reasoning Test's purpose
Predict the college success of high school seniors
What type of test is the EPPP
A measure of basic psychology knowledge
Multiple Regression Analyses advantages over ANOVA
- Eliminates need for 2-stage analysis involving Global Significance Test followed by "fine grain" significance tests
- Not limited to categorical variables
- Enables researchers to determine if adding additional independent variables affects dependent variable beyond the effects found by the initial independent variables
Rational Economic model of decision making views decision makers as attempting to make
3 Components of a Needs Assessment
Organization Analysis, Task Analysis, and Person Analysis
Example of a point-biserial correlation
pregnant or not with multiple item stress test
What are you finding out about a predictor when you divide the number of (true positives) by the number of (true positives plus false negatives)
A predictor's SENSITIVITY
A psychologist that is testing people would likely find that in comparison with people with a low need for achievement, people with a high need for achievement would prefer which level of task difficulty?
Spearman- Brown formula is used for what?
Reliability coeffecient- To estimate the effects of increasing or decreasing the length of a test on it's reliability coefficient RANKS
What kind of distribution has a mean that is less than the median and a median that is less than the mode?
Don't forget left (lower) and right (higher)
IE: when using scores on 8 subscales of a test to predict the scores on 5 subscales of another test
Why would you chose a MANOVA over 2 ANOVAs?
Control for experimentwise error rate; see which factor(s) are truly important; may reveal differences that aren't apparent when doing them separately.
Moderator vs Mediator variable
A moderator variable effects the direction or strength of the relationship
A mediator variable explains the relationship - HOW or WHY
Understand confidence intervals and relationship to SE of measurement
68% confidence interval would be the raw score plus and minus (+ and -) the SE of the measurement
In an ANOVA that is comparing the effect of 4 individual variables on 1 dependent variable. What is a significant F value?
When it is greater than 1.0. OR the when the numerator is greater in a ratio of mean square between (numerator) over mean square within (denom)