AP Psychology Chapters 2&3

Paul has run a correlational study and found that as people age, their ability to hear high pitched sounds decreases. While you do not have a written copy of Paul's study in front of you, which of the following scores likely describes the finding of his study?

-.48

Which of the following is true about a negatively skewed distribution

the mean will be lower than the median

Which number best represents the median for the following data set? 4,4,5,7,7,9,11,12,15,18,18,22

10

Which of the following statements can be made about a normal distribution without knowing specific information about the data?

84% of the population will score at or below a +1 standard deviation

A researcher determined that the less practice teenagers have driving, the more violations they received during the first year after having their driver's license. This finding is an example of which of the following?

A Negative Correlation

Tanya is helping the schools track and field coach recruit athletes for the upcoming season. She is timing her classmates as they run the 100 years dash. She has tested 20 students so far and wants to show her coach the results. Which of the following would be the most appropriate way for Tanya to display her data for the coach?

A histogram

Varun is graduating from college. He is excited to have received a job offer from a small accounting firm near his home. During his research on the company, he found that most of the firm's 50 employees are recent college graduates like himself who make 43,000 dollars per year, There are 5 managers who make 80,000 dollars per year, a VP who makes 120,000 dollars per year and a CEO who makes 300,000 dollars per year. Which of the following best represents Varun's findings on the salaries of the employees at the accounting firm?

A positively skewed distribution

Which of the following is the best example of random selection?

Arbitrarily selecting names from everyone in the population ro determine who will be in the study.

What is the best way for a researcher to avoid unconsciously signaling any point of view to the participants in a study?

Double Blind Study

A researcher who had a role in designing a new medication for headaches wants to promote it. She unconsciously suggests to those who took her medicine that they are feeling better than those who had an alternative medicine. This demonstrates which of the following phenomena?

Experimenter Bias

A researcher wants to investigate a unique brain tumor in a twelve year old child to see how the tumor affects the child's behavior. The researcher will conduct a battery of cognitive and physical tests with the child over a course of 6 months to account for potential changes in the tumors size and impacts. Which of the following would be the best research method to study this situation?

Individual Case Study

Jessicas chemistry instructor told the class that the results of their exam was normally distributed. Because Jessica had been paying attention in her psych class, she knows what this means. The instructor hands back the exams telling the students that the mean was 80 and the standard deviation was 4. Jessica score on the exam was 88. She wants to compute her percentile rank to see how she did in comparison to her classmates. Which of the following is correct about Jessica's exam score?

Jessicas percentile rank is 97.5

Mary is an undergraduate student who has volunteered for a study her professor is running. During the study, Mary picks up on cues from her professor about the expectations he has regarding the outcome of the study. The professor does not realize he is giving these cues, and she does not realize she is picking up on them, yet she behaves as he expects. Which of the following phenomena has occurred?

Mary has displayed demand characteristics

Each semester, high schools across the country compute students GPAS. Which of the following is a measure of central tendency that best represents a students cumulative GPA?

Mean

Natasha is judging the science fair projects of the students in her class. The final round has narrowed the competition down to the top ten students who all must be placed in rank order and compared to one another in regard to their scientific abilities and the qualities of their projects. Which type of data is she working with?

Ordinal

An experimenter wants to determine the impact of caffeine on attention span. Which of the following best represents random assignment?

Placing participants into either the caffeine or non-caffeine group without any set pattern

A graduate study wants to conduct a study to investigate people's opinions regarding the death penalty. Because he has not yet taken his research methods course, he does not know which technique would be best to gather data on the issue. Based on what you have read about research techniques, which go the following techniques would work best for his proposed study?

Survey

Alice has just found that the study she has been conducting over the last two Years has yielded statistically significant results. She wants to tell. her parents about exciting news, but they do not know much about stat. Which of the following statements can Alice share with her parents to summarize the meaning of statistical significance?

the results are unlikely due to chance

A researcher has found that the more time athletes spend training in track and field, the lower their times in the 100-meter run. She determines that this result means that training causes drops in times. Which of the following is true about this study?

The researcher has falsely determined that correlation proves causation.

A researcher wants to determine if studding for a half hour each night for a week in preparation for an exam is better than studying for three and a half hours on Sunday evening before the exam on. Monday. Researchers will randomly select participants for the study and randomly place participants into either the massed (Sunday night) or distributed (half hour a night) study group. They will also measure the outcome of each unit exam (both groups will take the same exam). What is the dependent variable of this experiment>

The score on each exam