The situation which is appropriate for repeated-measures research design is Comparing pain tolerance with and without acupuncture needles.
The same group of sample size is subjected to many tests within the same experiment when using a repeated-measure study design, and in situation "b," the sample participants are tested for pain tolerance both before and after taking pain medication. Independent-measures designs are an illustration for all other situations.
One of the researcher's key tasks is to select the design approach to use when examining the effectiveness of studies, experiments, and research. Within-subject, independent-measures, and matched-subject designs are some of the numerous design approaches the researcher can use.
To know more about Repeated Measures Method, click here :
https://brainly.com/question/28215973
#SPJ4