RESEARCH METHODS MIDTERM - MCPHS
SPRING 2024/25 QS & AS
what is the Pearson correlation coefficient? Correct Ans-looks for parametric data-linear
associations; unitless; r = between -1 and 1
what is the general equation for a line? Correct Ans-Y (hat) = alpha +beta(X) + error
what does Y hat represent in the linear equation? Correct Ans-predicted outcome
what does alpha represent in the linear equation? Correct Ans-the Y intercept of the line
what does beta represent in the linear equation? Correct Ans-the slope of the line
what does X represent in the linear equation? Correct Ans-the predictor/independent variable
what does r^2 mean for Pearson correlation? Correct Ans-the percentage of the variability (Y)
that can be explained by the predictor (X)
how do you write an equation for multiple linear regression? Correct Ans-Y (hat) = alpha +
beta1(X1) + beta2(X2)... + error
, what is parametric data? Correct Ans-data that show an approximate normal distribution on a
histogram
what is non-parametric data? Correct Ans-data that is not normally distributed; may be
skewed to one side
how can non-parametric data be analyzed? Correct Ans-by ranking
what type of variables does Chi-square test use? Correct Ans-X = 1 categorical (2 or more
groups)
Y = 1 categorical (2 or more groups)
mothers smoking status and if a child is born with low birth weigh is an example of? Correct
Ans-it is an example of Chi-square
what types of variables does Fisher's Exact test use? Correct Ans-X = 1 categorical (nominal;
2 groups)
Y = 1 categorical (nominal; 2 groups)
what non-parametric test is used for small sample sizes? Correct Ans-Fisher's Exact test is
what is McNemar's Test used for? Correct Ans-for non-parametric paired data or correlated
samples (ex. attitude about an event before and after the event)
SPRING 2024/25 QS & AS
what is the Pearson correlation coefficient? Correct Ans-looks for parametric data-linear
associations; unitless; r = between -1 and 1
what is the general equation for a line? Correct Ans-Y (hat) = alpha +beta(X) + error
what does Y hat represent in the linear equation? Correct Ans-predicted outcome
what does alpha represent in the linear equation? Correct Ans-the Y intercept of the line
what does beta represent in the linear equation? Correct Ans-the slope of the line
what does X represent in the linear equation? Correct Ans-the predictor/independent variable
what does r^2 mean for Pearson correlation? Correct Ans-the percentage of the variability (Y)
that can be explained by the predictor (X)
how do you write an equation for multiple linear regression? Correct Ans-Y (hat) = alpha +
beta1(X1) + beta2(X2)... + error
, what is parametric data? Correct Ans-data that show an approximate normal distribution on a
histogram
what is non-parametric data? Correct Ans-data that is not normally distributed; may be
skewed to one side
how can non-parametric data be analyzed? Correct Ans-by ranking
what type of variables does Chi-square test use? Correct Ans-X = 1 categorical (2 or more
groups)
Y = 1 categorical (2 or more groups)
mothers smoking status and if a child is born with low birth weigh is an example of? Correct
Ans-it is an example of Chi-square
what types of variables does Fisher's Exact test use? Correct Ans-X = 1 categorical (nominal;
2 groups)
Y = 1 categorical (nominal; 2 groups)
what non-parametric test is used for small sample sizes? Correct Ans-Fisher's Exact test is
what is McNemar's Test used for? Correct Ans-for non-parametric paired data or correlated
samples (ex. attitude about an event before and after the event)
