Interested in learning how intelligence quotient affects a woman's marital prospects, researchers gave intelligence tests to a sample of 11-year-old girls, then retested them and asked about relationship status several times over the next 40 years. this type of study has a design.

longitudinal            

Explanation:

Longitudinal design: The term longitudinal study is also referred to as a panel study or longitudinal survey. This is a type of research design that encompasses repeated observation of specific variables for long and short-periods, for example, people. A longitudinal study is purely qualitative.

Example: A person being examined based on certain characteristics of different age in his or her life.

Types:

1. Panel study.

2. Cohort study.

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