Ch. 6 Review Questions
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1
what type of graph is most usefyl for illustrating the difference in survival rates for two or more groups?
- scatterplot
- histogram
- Kaplan Meir curve
- correlation matrix
2
When the outcome is dichotomous and it occurs in more than 10% of the sample, which statistic is a more accurate estimate?
- pearson product - moment correlation
- linear regression
- odds ratio
- risk ratio
3
Which value is most often used to represent the unique variance contributed by a variable or set of variables in linear regression?
- r
- R2
- R2 change
- b weight
4
In a risk ratio, if a predictor variable contributes nothing to determing the outcome, what will the RR equal?
- 0
- 1.0
- -1.0
- 0.05
5
Multicollinearity means that
- many of the predictor variables are inter-correlated
- many correlations are being performed
- there are multiple predictors included in the regression equation
- a survival curve is created as part of the results
6
Which of the following is an example of a negative correlation
- fewer hours of sleep is related to a lower grade on a test
- the correlation between sleep and range of motion is R = 0.0
- fewer hours of sleep relates to more errors on a test
- more hours of sleep relates to a higher grade on a test
7
Which of the following statistics is an effect size?
- r
- Cl
- p
- N
8
Which statistic would you use for examining the relationship between two continuous variables in a cross-sectional study
- Pearson product moment correlation
- linear regression
- odds ratio
- risk ratio
9
which of the following indicates the strongest relationship
- r=0.4
- r= -0.8
- r=0.6
- p<0.01
10
Confidence intervals are used to explain the excepted population values regarding what type of relationship statistic?
- r
- R2
- p
- OR
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