APFIVE A researcher investigates different strategies used by test takers when answering a 100-question multiple–choice exam. In the experiment, the researcher collects data from 1000 students and computes the probability of using each strategy. After summing the absolute counts of students employing each strategy, the student researcher makes an error. What was the mistake in the experimental procedure?
Table 2: Strategies in Test-Taking
| Strategy | Count |
|---|---|
| Guess | 320 |
| Answer © | 350 |
| Longest Answer | 330 |
(Note: The data comes from a study of 1000 test takers.)
Failing to convert the counts into probabilities by dividing by the total sample size.
Using rounding methods that inflated some percentages while deflating others.
Switching the roles of independent and dependent events in the calculation of joint probabilities.
Assuming that the strategies were mutually exclusive and therefore not needing to compute separate probabilities.
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