| Tag | Value |
|---|---|
| file | Descriptive-statistics_uva-variance-404-en_uva-variance-404-en |
| name | uva-variance-404-en |
| section | Descriptive statistics/Summary Statistics/Measures of Spread/Variance |
| type | schoice |
| solution | FALSE, FALSE, TRUE, FALSE |
| Type | Calculation |
| Language | English |
| Level | Statistical Literacy |
| IRT-Difficulty | 3.229 |
| p-value | 0.2512 |
X and Y are independent stochastic variables with expectation 12 and 21, respectively, and variance 4 and 9, respectively. Then the variance of Y - X is equal to