For the scenario below identify which threat to internal val…

For the scenario below identify which threat to internal validity (time, group, mortality or atypical behaviors) is of most concern and provide one way to control for the threat. A research conducted a year long study that began with group of 200 hundred individuals.  At the end of the year only 140 individuals remained in the study. 

Read the scenario below to determine which one of the time t…

Read the scenario below to determine which one of the time threats to internal validity (test reactivity, instrumentation, history and maturation) is of most concern and provide one way of controlling for the threat. In a short experiment designed to investigate the effect of computer-based instruction, students missed some instruction because of a power failure at the school