Suppose your teacher accidentally gives you a multiple-choice calculus test, instead of an Algebra 2 test. There are 40 true-false questions, and you and your classmates answer the questions randomly. The probability of getting an answer correct is 1/2 . You can use 1/2 as the population proportion.
Compare your results with the results obtained by the rest of the class. At a 95% confidence level, what percentage of the results in the class showed a statistically significant difference from a score you would expect to get by guessing?