Question

a researcher wants to know if a teachers race and gender affects students achievement in introductory statistics classes. teacher a is identified as white male is assigned to teach 30 students. teacher b is identified as asian female assigned to teach a separate 30 student class. (a) is this a random sampling or random assignment? random sampling random assignment (b) select the control group(s) of the study. select all that apply. teachers a students teachers b students students who are enrolled in the introductory statistics class teacher a teacher b the researcher none of the above

Explanation:

(a) Random assignment is when subjects are assigned to different groups (here, different teachers' classes). It's not about selecting a sample from a population (random sampling).
(b) In an experiment to see how teacher's race and gender affect students' achievement, there is no clear - cut control group among the given options. The students in both classes are experimental groups being exposed to different teacher characteristics.

Answer:

(a) Random assignment
(b) None of the above