Counting Outcomes and Compound Probability
Some questions ask about more than one event at once: flip a coin and roll a die, or pick a shirt and pick pants. To handle these, you first need to count all the possible outcomes, and then you can find the probability of a combined (compound) event. Two simple tools make this easy: the […]
Reliability: Sample Size and Repetition
Two experiments can test the same idea and deserve very different levels of trust. What separates a convincing result from a shaky one often comes down to two things: how many subjects were tested (the sample size) and whether the test was repeated. This lesson explains why both matter, because “the study was too small” […]
