Foundation
- 1Correlation and Causation (Foundation)
A researcher finds that towns with more fire engines have more fire damage, and concludes that fire engines cause fire damage. Identify the flaw in this reasoning and suggest the true common cause.
- 2Risk (Foundation)
Out of 200 people who ate a certain meal, 10 became ill. What is the risk of becoming ill, as a fraction in its simplest form?
- 3Skewness by Inspection
Describe, using the mean and median, how you could tell that a distribution is positively skewed without drawing a graph.
- 4Percentiles
A cumulative frequency graph shows that a value of 18 corresponds to a cumulative frequency of 45 out of 60 total data points. Find the percentile.
- 5Crude Rate and Rates of Change
A town of population 10,000 records 20 births in a year. Find the crude birth rate per 1000 people.
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