Exploring Two–Variable Data
In analyzing data from a school election, if you want to determine whether grade level and candidate choice are associated with each other without regard to actual vote counts, which measure would be most appropriate?
What does it mean if two categorical variables are independent?
Which measure helps determine if there is an association between two categorical variables in a contingency table?
What is a plausible reason for finding a positive correlation between ice cream sales and drowning incidents without implying causation?
Which type of variable cannot be meaningfully ordered or measured on a continuous scale?
What is the marginal relative frequency of people who take longer than 20 minutes to run a mile?
| <20 min | >=20 min | Total | |
|---|---|---|---|
| <18 yo | 120 | 180 | 300 |
| >=18 yo | 180 | 220 | 400 |
| Total | 300 | 400 | ... |
If a researcher wants to compare the success rates of two treatments for a disease, which study design would best allow for causal conclusions?
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A survey has two response options, 'Yes' or 'No'. If every participant answers randomly, what's the likelihood that any one participant will answer 'Yes'?
When examining the relationship between smoking status (smoker or non-smoker) and exercise frequency (daily, weekly, seldom), which graphical display would allow you to compare conditional distributions effectively?
In flipping a fair coin twice, what is the probability that both flips will result in heads?