Threat to the internal validity of an experiment

What percentage of the population is most susceptible
April 9, 2020
The genotype of the female parent in this cross
April 9, 2020

Threat to the internal validity of an experiment

Which one of the following is not a threat to the internal validity of an experiment?

    maturation
    regression effect
    random error
    mortality

 

An experiment in which extraneous variables are controlled is said to be

    internally reliable
    internally valid
    externally valid
    externally reliable

Using a convenience sample instead of a random sample of subjects is a threat to which kind of validity?

    internal
    external
    construct
    statistical

Any bias in selecting subjects for an experiment threatens the ____ of the experiment.

    internal validity
    internal reliability
    statistical validity
    statistical reliability