Dr. McLean has designed a study to test the cognitive skills of people in their 30s, 50s, and 70s, where data is collected over the course of a day through a series of tests. What type of research approach is Dr. McLean using?

a. Longitudinal
b. Cohort
c. Latitudinal
d. Cross-sectional

d. Cross-sectional

Explanation:

In research, a cross-sectional study refers to a type of study where the researcher makes observation on a sample at a specific point of time. In other words, the researcher wants to know what is happening in a group at a specific point of time and the data is gathered at one specific point of time too.

In this example, Dr. McLean wants to study the cognitive skills of people in their 30s, 50s, and 70s and he collects the data over the course of a day. We can see that the researcher wants to know what is happening at a specific point of the lifespan (30s, 50s and 70s) and that he/she is collecting the data at one specific point of time (one day). Therefore, this would be a cross-sectional study.

Cross-sectional study

Explanation:

A cross-sectional study involves looking at data from a population at one specific point in time. Dr. Mclean designed a study to test the cognitive skills of people in their 30s,50s and 70s this is a cross sectional study ranging of different age groups at a specific time.