The two most important potential confounding factors in time-series designs are

The Hatcher Act consisted of a series of legislative acts, executive orders, and proclamations creating large-scale federal programs that sought to provide retirement insurance, health care, economic security, and poverty relief for Americans

Indicate whether the statement is true or false.

Between 1870 and 1920, cities grew

a. mostly upwards. b. mostly outwards. c. both upwards and outwards. d. at a slower rate than during the previous 50 years.