PHMR 701 Session 4

Which of the following is the least affected by outliers?

• Range

• Mean

• Median

• Standard Deviation

Assuming the assumptions of parametric tests are met, non-parametric tests, compared to their parametric counterparts:

• Are less likely to accept the alternative hypothesis

• Are more conservative

• Have less statistical power

• Are all of these

Which of the following does a box–whisker plot not display?

• Mean

• Median

• Outliers

• Lower quartile

After a Kruskal-Wallis test indicates that there is a difference between three or more groups, what is the next step?

• Analysis of Variance with Tukey's post hoc

• Independent t-tests with Levene's correction

• Mann-Whitney tests with Bonferroni correction

• None of these

Which of the following statements about outliers is NOT true?

• Outliers are values very different from the rest of the data

• Influential cases will always show up as outliers

• Outliers have an effect on the mean

• Outliers have an effect on regression parameters

A researcher measured people’s physiological reactions (continuous) while lying about what their teacher said. She split the data into two groups: males and females. The resulting data were normally distributed and men and women had equal variances. What test should be used to analyze the data?

• Dependent T-test

• Independent T-test

• Mann-Whitney test

• Wilcoxon signed-rank test

We want to see if breast cancer mortality (Y/N) can be predicted by the predictors age (continuous), family history (Y/N), genetic risk score (continuous). Which test needs to be used?

• Multiple Linear regression

• Survival Analysis

• Pearson Correlation

• Binary Logistic Regression

DATASET CARS: What is the average lease cost across the sample? Round to 1 decimal (e.g. 100.1)

DATASET CARS: What is the standard deviation of the lease cost across the sample? Round to 1 decimal

DATASET CARS: If we want to know if there is a statistical association between gender and age class (assume normality), which test needs to be done?

• Pearson's Chi Square

• Correlation

• Independent t-test

• ANOVA