- CFA Exams
- CFA Level I Exam
- Study Session 3. Quantitative Methods (2)
- Reading 10. Sampling and Estimation
- Subject 1. Introduction

###
**CFA Practice Question**

Of the following statements:

II. In a simple random sample, each item in the sample has the same probability of being sampled.

I. In a stratified random sample, each item in the sample has the same probability of being sampled.

II. In a simple random sample, each item in the sample has the same probability of being sampled.

A. Only I is true.

B. Only II is true.

C. I and II are true.

###
**User Contributed Comments**
3

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

danlan |
In stratified random sample, items are groups to represent each group of interest, so each item may have different probability of being sampled. |

Jurrens |
to expand on danlan: Every group may have different number of members, ie, one group has 5 and the other has 2. If one member from each group is chosen, the group with 2 has a much beeter chance of being selected. |

renataa |
Thanks Jurrens, very helpful |