Which of the Following Is Not One of the Eras

question 20

Multiple Choice

Which of the following is not one of the eras within the Phanerozoic eon?

• A)Mesozoic
• B)Cenozoic
• C)Protozoic
• D)Paleozoic

---

Definitions:

Pretest-Posttest Nonequivalent Groups Design

A quasi-experimental design involving two groups that are not randomly assigned, with both groups measured both before (pretest) and after (posttest) a treatment or intervention.

Posttest-Only Nonequivalent Groups Design

An experimental design in which different groups are compared only after the treatment or intervention, without a pretest comparison.

Pretreatment Differences

Variations among participants in a study that exist before the intervention or treatment is applied.

True Experimental Design

A research design that includes random assignment of participants to conditions and manipulation of an independent variable to determine its effect.