- CFA Exams
- 2021 CFA Level I Exam
- Study Session 3. Quantitative Methods (2)
- Reading 11. Hypothesis Testing
- Subject 2. Null Hypothesis and Alternative Hypothesis

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**CFA Practice Question**

A researcher is seeking to prove that the mean number of teenagers who will start smoking this year is less than the mean number of teenagers who started smoking last year. What type of test should he/she use?

B. one-tailed test

C. alternative hypothesis

A. two-tailed test

B. one-tailed test

C. alternative hypothesis

Correct Answer: B

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**User Contributed Comments**
2

User |
Comment |
---|---|

nufan |
B is right because "is less than the mean" = one-tailed test |

got2pass |
less than or greater than would use the one-tailed test |