Major parties sometimes adopt third party issues.

question 19 options:
true
false

True

Explanation:

A Third party "also called a minor party, a third party is a US political party other than the two major parties (the Republican Party and the Democratic Party); third parties rarely win elections in the United States, but frequently influence national politics by drawing attention to issues previously neglected by the major parties

[...]the two major parties frequently incorporate the platforms of third parties into their own platforms; voters who identified with a third-party issue will often vote for a major party candidate who has adopted that issue because major parties are more likely to succeed."

Reference: Khan Academy. “Third-Party Politics: Lesson Overview.” Khan Academy, Khan Academy, 2019

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.