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Research Final
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Terms in this set (32)
Used when the researcher knows some of the variables within a population that will affect the representativeness of the sample. Ex: gender, age, ethnicity, dx.
Stratified random sampling
A list of all the states, cities, institutions associated with the population is developed. Those are then randomly selected from the list to form the sample
Cluster sampling
Concerned with the consistency of repeated measures of the same variable with the same scale or measurement method. test-retest reliability.
Stability
What technique is most commonly used to determine homogeneity reliability?
Chronbach Alpha
What are the lowest and highest reliability coefficients?
-1 and +1
A measurement method has ___ if it accurately reflects the concept it is supposed to be measuring.
Validity
Examines the extent to which the measurement method includes all the major elements relevant to the concept being measured.
Content-related validity
Examined by comparing the new instrument with an existing one that measures the same thing
Convergent validity
Examines if an instrument includes the elements of the concept being measured.
Validity from factor analysis
The mean is the measure of _____
Central tendency
The standard deviation is a measure or
dispersion
Parametric analysis technique used to determine significant differences between the scores obtained from two groups.
t-test
Can only be used once, or else the risk for type 1 error increases
t-test
Statistical technique used to examine differences between two or more groups. The F-ratio is calculated and indicates the extent to which group means differ, taking into account the variability within the groups.
ANOVA
Anova F value:
F(1,343)=15.46, p < 0.001
F=
1=
343=
15.46
the statistic
the group degrees of freedom, K-1. K=#groups in study
error degrees of freedom N-k
F ratio
Inferential test used to examine the differences among groups with variables measured at the nominal level.
Chi Square X2
More than one independent variable is entered into the analysis to predict a dependent variable.
Multiple regression
Typically used to determine correlations for interval and ratio level data.
Pearson r analysis
The purpose of ____ is to predict an outcome or Dv using 2 or more IVs
multiple regression analysis
The use of one IV , x, to predict one DV, y
Simple linear regression
Simple Regression:
In Y=a+bx,
b=
a=
the slope
y intercept
The most common correlational analysis technique used to examine the relationship between two variables measured at the interval or ratio level.
Pearson's Correlation Coefficient.
r2-->___% or greater is significant clinically
9
For a t-test, the sample size needs to be of the same _____
variance
Formula for Bonferroni
alpha/# of tests being performed
Must have a dependent and independent variable before it can be performed
ANOVA
Nonparametric test used when the assumptions of the Pearson's analysis cannot be met.
Spearman rho
Used to analyze data that are ordinal LOM or scores measured at the I/R level that are skewed.
Spearman rho
Nonparametric test used to detect differences between two independent groups.
Mann-Whitney U
The most powerful of the nonparametric tests, with 95% of the power of the t-test.
Mann-Whitney U
Measure of central tendency used when data is measured at the ordinal level
Median
If a test has ____ sensitivity, it has a high percentage of false negatives.
low
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