Which scenario is an example of a longitudinal research design?
a. dr. michaels administers a questionnaire to gather data on childhood friendships to a group of 5-year-olds. she meets with the original group of children in the study every year and gives them the same questionnaire until they are 10 years old.
b. dr. michaels administers a questionnaire to gather data on childhood friendships to a group of 7-year-olds.
c. dr. michaels administers a questionnaire to gather data on childhood friendships to a group of 5-, 6-, and 7-year-olds. she meets with all three groups and gives them the same questionnaire for the next 3 years and stops when they are 8, 9, and 10 years old.
d. dr. michaels administers a questionnaire to gather data on childhood friendships to a group of 7-year-olds and a group of 10-year-olds.

c. Dr. Michaels administers a questionnaire to gather data on childhood friendships to a group of 5-, 6-, and 7-year-olds. She meets with all three groups and gives them the same questionnaire for the next 3 years and stops when they are 8, 9, and 10 years old.

Explanation:

A longitudinal study in research design can be define as the study which is associated with the repeated observation of the same kind of variable(s). Such variables are examined for the short and long periods of time. It is a type of observational study that can be structured as randomized experiments.

C. is the correct option this is because of the fact that the a single variable is used here that is friendship, to make it a longitudinal study with the same children that were assessed in different years of their age at different time duration.

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my intake in minerals was normal. there really is no need to improve, i am healthy, and i am experiencing no nausea or diarrhea. i am as healthy as a bee. ☺ (sorry that i cannot you with the mineral intake)

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