Which of the following dates is incorrect?
a.
Between 1852 and 1853, the first rail lines were constructed in Texas.
b.
The Mexican Railway was completed in 1869.
c.
The steam engine was greatly improved by Scottish inventor James Watt in 1769.
d.
Abraham Lincoln signed the Pacific Railroad Act on July 2, 1862.

Earlier studies were more slanted toward a. the upper class. c. caucasian males. b. teenagers in school. d. caucasian females. select the best answer from the choices provided a b c d

Using mr smith and his id, identify two potential internal validity threats that might affect the a—b design. tell me how that threat might impact conclusions in the a—b design. note #1: you cannot use maturation (since i already did that one for note #2: there are some mr smith id threats that won’t have much impact in a single case design.

Sociologists found that the effects of institutionalization on infants, i.e. lack of a caring environment, will result in slower development of their mental, physical, and emotional skills. true or false? ?