Slopes
When comparing average commute times by car vs public transportation within one city, what method ensures independence between samples?
In a blind taste-test experiment comparing four brands of cola, how can experimenters reduce variability unrelated to cola preference?
In assessing the relationship between hours studied per week (continuous) and final exam score (continuous), what would be the most appropriate method to determine if there exists a significant predictive relationship?
If a linear regression model has a residual plot with increasing variability as the predicted values increase, which transformation of the response variable could potentially correct this heteroscedasticity?
If researchers want to compare median survival times across more than two groups, what non-parametric statistical test should they use given censored data is present?
What statistical measure describes how far away each data point tends to be from the mean?
In considering patterns within time series plots, what feature might flag an unusual observation?
How are we doing?
Give us your feedback and let us know how we can improve
In which scenario would a stratified random sample be most beneficial compared to a simple random sample?
Which method involves selecting individuals to be included in a sample based on set criteria or convenience?
What characteristic in a residual plot would suggest that there may be outliers or influential observations in your data set?