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Tyrel is testing whether exposure to political news causes people to be more opinionated. For each participant, Tyrel flips a coin and places all the heads in one group and all the tails in another. The heads group watches 20 minutes of political news, while the tails group watches 20 minutes of local nonpolitical news. Afterward, all participants write a persuasive essay and Tyrel measures how strongly and how many times they state their opinions.

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Explanation:

Tyrel is testing whether exposure to political news causes people to be more opinionated. For each participant, Tyrel flips a coin and places all the heads in one group and all the tails in another. The heads group watches 20 minutes of political news, while the tails group watches 20 minutes of local nonpolitical news. Afterward, all participants write a persuasive essay and Tyrel measures how strongly and how many times they state their opinions.Tyrel would make use of either random assignment  random assignment  or posttest-only design in this study, these design gives same opportunity to be assigned and equal chance to the participant of the test .