- CFA Exams
- CFA Level I Exam
- Topic 1. Quantitative Methods
- Learning Module 8. Hypothesis Testing
- Subject 9. Tests Concerning Differences between Means with Dependent Samples
CFA Practice Question
If a researcher was conducting a paired difference experiment for a sample size of 100 with a 90% confidence interval, which of the following test statistics would he/she use for a two-tailed test?
A. z0.05 = 1.645
B. t0.05 = 1.66
C. z0.1 = 1.28
User Contributed Comments 6
| User | Comment |
|---|---|
| mtcfa | It has to be B since a paired comparison test requires a t-table. |
| cfaeater | So we use the t-table, then look at 120 df (as this is the closest to 100 in the df column), then look down the .10 significance column for a two tailed test and come to 1.658? Are we all in agreement? |
| homersimpson | oh t table ... |
| thanhb91 | The book suggests that we use z only if population variance is known; otherwise, use t for small and large sample. Z can be use as an alternative when sample size is large (>30) |
| Emanco | Since we don't have the standard deviation, directly we choose the t statistic. |
| nmech1984 | Guys z or t or x table is not provided when you are examed. |