- CFA Exams
- CFA Level I Exam
- Study Session 3. Quantitative Methods (2)
- Reading 10. Sampling and Estimation
- Subject 6. Confidence Intervals for the Population Mean

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**CFA Practice Question**

A statistician has randomly selected 25 samples from a production line for testing. In order for this sample to be a valid indication of the population, what assumption about the sample is necessary?

II. The population of paired differences must be normal.

III. The population must have a normal distribution.

I. The population variance is equal to the population mean.

II. The population of paired differences must be normal.

III. The population must have a normal distribution.

A. III only

B. II and III

C. I and III

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