Bonita is participating in a longitudinal study that began when she was only two years old. now in her late 20s, bonita has undergone a series of cognitive tests every six months for more than 25 years. the study in which bonita is participating is best described as an study.
a) cross sectional
b) time series
c) independent measures
d) repeated measures

b) time series

Explanation:

Time-series study: Th term time-series study refers to the process in which it is responsible for analyzing or examine time-series data to get meaningful statistics and related data's characteristics. Time-series study analyzes the future value based on the formerly observed values. It is generally used for longitudinal research that includes a single subject or participants that is being measured continuously and repeatedly in regular intervals of time.

In the question above, the study in which Bonita is participating is best described as a time-series study.

answer; (d) none of the above;

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.