please help this is very important i will give you brain thing if its correct and no links pwease <3

Population parameters are difficult to calculate due to

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.

Why would nations in latin america be part of a mostly arab cartel group known as opec? a) latin america refused to do business with countries that were not part of opec. eliminate b) natural resources such as oil are a major economic development for some latin american countries. c) latin america has a long history of distrust of the united states and fears a take-over of oil fields. d) latin american nations such as venezuela needed in getting natural resources to other parts of the world. 15