One typical way to select a sample is to randomly pick phone numbers from a telephone book. Which of the following explains how the selection of the sample could be biased?

Luminous objects such as flashlights emit light that we can see. how do we see an object that isn’t luminous? a. the object emits light that reaches our eyes. b. light reflects off the object and reaches our eyes. c. light passes through the object uninterrupted. d. light is fully absorbed by the object. e. we can’t see an object that isn’t luminous.

Students taking a clep exam can earn between college credits, depending on the college's policies.

The tendency to seek out individuals who represent the same level of physical attractiveness as ourselves is explained as