| Tag | Value |
|---|---|
| file | Inferential_Statistics_uva-confidence-level-201-en_uva-confidence-level-201-en |
| name | uva-confidence-level-201-en |
| section | Inferential Statistics/Confidence Intervals/Confidence level |
| type | schoice |
| solution | FALSE, FALSE, TRUE |
| Type | Conceptual, Calculation |
| Language | English |
| Level | Statistical Literacy |
| IRT-Difficulty | 3.871 |
| p-value | 0.1449 |
On a confidence interval for a mean, the z-score should be should be replaced by a t-score when the population standard deviation σ is unknown. When such an interval is based on a sample of 20 observations, that t-score at a confidence level of 95% is equal to