________ is the traditional start of the general election campaign in texas.

A ________ was a tax charged to voters as a prerequisite for registration.

A candidate must win by ____________ to win a primary in texas.

A council form of government in texas often refers to a _________ mayor.

All of the following are constitutional powers of the president except the power to ________.

The 1946 regulation of lobbying act required lobbyists to _____.

The extent to which the results of an experiment can be generalized across populations, times, and settings is referred to as external validity.

Including only sophomores from a single college in the sample can affect internal validity.

Differences between the answers to a pretest and a posttest are generally considered to ______.

The time, location, and other physical aspects are considered to be extraneous factors or influences that might affect the dependent variable.

A pretest is used in which type of research design?