A researcher is conducting research on using technology in teaching. The researcher has two groups. The first group receives instruction via a PowerPoint presentation that is online. The second group attends a class and receives instruction from a teacher face to face. The researcher classifies the students based on when they volunteer for the study. The first 50 students who volunteer receive online instruction. The next 50 receive instruction by attending a class with a teacher. The type of instruction the student receives is the:

Standardized variable

Explanation:

Standardized variable: In research methods, the term "standardized variable" is also referred to as "standard score" or "z-score" and is described as one of the different variables that have been "re-scaled" to possess a standard deviation of 1 and a mean of 0. Moreover, these variables tend to contain different students score on a specific test related to the wisdom of social studies, mathematics, and science. However, teachers and authors generally use a standardized variable in contrast with control variables and it is supposed to be "constant" in specific research or an experiment.

In the question above, the given statement represents the "standardized variable".

world war i had a devastating effect on german-americans and their cultural heritage. up until that point   german-americans, as a group, had been spared much of the discrimination, abuse, rejection, collective mistrust experienced by so many different racial and ethnic groups in the history of the united states. indeed, over the years, they had been viewed as a well integrated and esteemed part of american society. all of this change with the outbreak of war.