B. saved lives. Mandatory seatbelt laws have saved lives.
Answer:
The representative's bias
Explanation:
Representatives bias is a cognitive bias. In this bias, an individual will categories the situation on the bases of the previous experience. It is very useful when a person wants to take a quick decision. But it is limited for those who are stereotyped. It includes many representative heuristic biases.
Thus here in the above statement, John gets to know about Michelle who is blonde hair, likes the beach and lived in Newyork. John assumes that she is from California because 85% of students were from California. This is the best example of representative bias
The air pollution is caused by toxic gases such as carbon monoxide
Answer:
C. a third variable, such as students' home environment, must have caused students to both drink more non-diet soda and engage in aggressive acts
Explanation:
From the question, we are informed about An observational study that was conducted in inner-city Boston approximately four years ago demonstrated that high-school students who consumed more than five cans of non-diet soda every week were between 9 and 15-percent likelier to engage in an aggressive act compared with counterparts who drank less non- diet soda. In this case, we can reliably conclude that a third variable, such as students' home environment, must have caused students to both drink more non-diet soda and engage in aggressive acts.
Observational studies can be regarded as studies whereby
researchers make observation about different effect of factors such as
risk factor, home, as well as environment and diagnostic test that affects the experiment. In observational studies Variables are very crucial, A variable can be anything that that is liable to change, it can change and it can be changed as well. They are factors which the observer can manipulate or control for when carrying out experiments.
