Question

determine whether the study is an experiment or an observational study, and then identify a major problem with the study. a medical researcher tested for a difference in systolic blood - pressure levels between male and female students who are 12 years of age. the randomly selected four males and four females for the study. this is an blank because the researcher blank the individuals. observational study experiment

Explanation:

In an observational study, the researcher only observes and measures characteristics without influencing the subjects. Here, the medical researcher is just looking at the systolic blood - pressure levels of male and female 12 - year - old students without manipulating any variables. A major problem is the small sample size (only four males and four females), which may not be representative of the entire population of 12 - year - old students.

Answer:

This is an observational study because the researcher observes the individuals.
A major problem: Small sample size.