Chapter 6 Flashcards
What type of graph is most useful for illustrating the difference in survival rates for two or more groups?
a. Scatterplot
b. Histogram
c. Kaplan Meir curve
d. Correlation matrix
Kaplan Meir curve
When the outcome is dichotomous and it occurs in more than 10% of the sample, which statistic is a more accurate estimate?
a. Pearson product-moment correlation
b. Linear regression
c. Odds ratio
d. Risk ratio
Risk ratio
Which value is most often used to represent the unique variance contributed by a variable or set of variables in linear regression?
a. r
b. R^2
c. R^2 change
d. b weight
R^2 change
In a risk ratio, if a predictor variable contributes nothing to determining the outcome, what will the RR equal?
a. 0
b. 1.0
c. -1.0
d. 0.05
1.0
Multicollinearity means that
a. Many of the predictor variables are inter-correlated
b. Many correlations are being performed
c. There are multiple predictors included in the regression equation
d. A survival curve is created as part of the results
Many of the predictor variables are inter-correlated
Which of the following is an example of a negative correlation?
a. Fewer hours of sleep is related to a lower grade on a test.
b. The correlation between sleep and range of motion is R = 0.0.
c. Fewer hours of sleep relates to more errors on a test.
d. More hours of sleep relates to a higher grade on a test.
Fewer hours of sleep relates to more errors on a test.
Which of the following statistics is an effect size?
a. r
b. CI
C. p
d. N
r
Which statistic would you use for examining the relationship between two continuous variables in a cross-sectional study?
a. Pearson product-moment correlation
b. Linear regression
c. Odds ratio
d. Risk ratio
Pearson product-moment correlation
Which of the following indicates the strongest relationship?
a. r= 0.4
b. r =-0.8
c. r = 0.6
d. p <0.01
r =-0.8
Confidence intervals are used to explain the expected population values regarding what type of relationship statistic?
a. r
b. R2
C. p
d. OR
OR
