These function compute the expected value and variance of a truncated random variable with the given specification over the truncated domain using numerical integration.
| 1 | 
| spec | A character vector for the name of the distribution (e.g., "norm") | 
| a | The minimum value allowed in the distribution (inclusive). | 
| b | The maximum value allowed in the distribution (inclusive). | 
| params | A list of distribution parameter name/value pairs | 
| ... | Distribution parameter arguments. Only used if 'params' is NULL. | 
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