Texas's population completed the transition from primarily rural to primarily urban in the 1940s

Pressure to reform the welfare system decreased among both Democrats and Republicans in the last decades of the twentieth century

Indicate whether the statement is true or false

To what does the term internal validity refer?

a) the degree to which results of a study can be generalized from one sample to another b) the process of subject selection c) the development of a treatment d) the degree to which the results of a study can be attributed to the manipulation of the independent variable