In a quasi-experiment
A)quasi differences are used,i.e. ,instead of △Y you need to use ( - λ × ),where 0

Question

In a quasi-experiment
A)quasi differences are used,i.e. ,instead of △Y you need to use ( - λ × ),where 0 < λ < 1. 
B)randomness is introduced by variations in individual circumstances that make it appear as if the treatment is randomly assigned. 
C)the causal effect has to be estimated through quasi maximum likelihood estimation. 
D)the t-statistic is no longer normally distributed in large samples.

Quizplus · Accepted Answer

In quasi-experiments, the treatment is not randomly assigned, but rather the groups are selected based on pre-existing characteristics. Therefore, individual circumstances that are not controlled for may introduce variability that makes it appear as if the treatment is randomly assigned. This is why randomness is introduced by variations in individual circumstances in a quasi-experiment.

In a Quasi-Experiment