Suppose a psychologist developed a test to measure intelligence, but this test was poorly developed and really only measured how well people perform on standardized tests (in other words, it doesn't actually measure intelligence). This test would lack

The answer is construct validity.

Explanation:

Construct validity is described as the degree in which a study actually measures what it claims to be measuring. A well-designed research will ideally have high construct validy, while a poorly designed one may confound the variables and result in measuring a different aspect.

For example, if a researcher tries to find which of two perfumes is more attractive to customers, but uses different shaped or coloured bottles, it's possible that the test will lack construct validity (the bottles may affect the customers' opinions).