author: russell carter

Principles and Applications Russell Carter, Jay Lubinsky. Selection. and. Assignment. of. Participants. Cluster Sampling Nonprobability Sampling Samples of Convenience Snowball Sampling Purposive Sampling Assignment to Groups Random ...

... A-B-A singlesubject design to study the effect of powered mobility on child ... withdrawal of the car in the A2 phase, thereby providing strong evidence ... designs (e.g., extended and stable 126 Section Three □ Experimental Designs.

... example used a patient characteristic (age) as the covariate. Another typical use of an ANCOVA is to test for differences between posttest scores using pretest scores as covariates. If pretest scores between groups are significantly ...