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Giovanni wants to investigate the effects of a new drug for attention deficit disorder in children but wants to minimize the effect of demand characteristics in both the experimenters and children. What method should he use in his administration of experimental and placebo drugs?

How many divisions occur in meiosis compared to mitosis?

Dr. Van Ryan is a social psychologist who is curious about how women’s clothing choices affects people’s perceptions of their intelligence. Specifically, she is curious how women who wear high heels are perceived in the workplace. She hypothesizes that there will be differences in perceptions of intelligence depending on whether they wear high heels or flat heels. She recruits 100 participants to view short silent film clips of a woman sitting at her desk, getting up from her desk with several papers, and walking over to talk to another female colleague in the next office. Half of the participants are randomly assigned to see her walking in high heels and the other half observe her walking in flat shoes. Dr. Van Ryan asks participants to rate the women’s intelligence in each condition. What is the measured variable in Dr. Van Ryan’s study?

A researcher finds a correlation between watching violent TV and physical aggression, but knows she can’t conclude that TV causes aggression because aggressive children could also choose to watch more violent TV. The problem being illustrated here is called:

Which of the following phrases would indicate that a researcher is making a causal claim?

A researcher conducts a study of the effects of drinking or not drinking coffee on calculus test scores in a group of college students. In this study, the presence or absence of coffee is the __________.

A researcher wants to test whether viewing television violence increases aggressive behavior. He allows his participants to choose whether they would prefer to view a violent or a nonviolent film. He then subsequently records the number of aggressive behaviors they show in a competitive game. The researcher cannot legitimately make a causal statement based on his findings, because his study:

Sheila wants to conduct a study that allows her to make a causal claim. What type of study does she need to use?

Nielsen Media Firms uses its “TV boxes” to record families’ TV habits. Every year, they report the average number of hours families spend watching TV. The most recent report showed that families watch an average of five hours and four minutes of TV per day. This is an example of:

Match each RNA with the corresponding function