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. She randomly selected four males and four females for her study. This is an ▼ because the researcher ▼ does not attempt to modify applies a treatment to the individuals. What is a major problem with the​ study? A. There is no​ blinding, which has a high chance of leading to bias. B. The sample includes male and female students. C. This is a convenience sample with voluntary​ response, which has a high chance of leading to bias. D. The sample is too small.

Answer 1

The study is an observational study because there is no treatment applied to the subjects, and the major issue with the study is that the sample size is too small, which could lead to unrepresentative results and potential Type II errors.

Step-by-step explanation:

The study described in the question is an observational study because the researcher does not attempt to modify or apply a treatment to the individuals involved. Instead, natural occurrences of systolic blood pressure levels among the selected male and female students are simply recorded for analysis.

A major problem with the study is that the sample size is too small. A sample of only eight students (four male and four female) is unlikely to be representative of the general population, and therefore, the results could be affected by random variation and may not be generalizable. This size limitation also heightens the chance of Type II errors, where real effects or differences are not detected because the sample does not provide enough data for conclusive analysis.

Answer 2

Observational study/The sample is too small

Step-by-step explanation:

The study is observational since there is no attempt to modify nor apply any kind of treatment.

An important problem in this study is the quantity of the sample. It is explained that the research selected only 8 individuals, which is not a significant sample. The minimum number of samples should be at least 30.