For each research description below, identify the independent variable, the dependent variable, and their scale of measurement

1. A researcher hypothesizes that blondes really do have more fun. To test this hypothesis, she interviews a natural brunette who has recently become a blonde to determine if there is any change in the amount of dates she hasbefore and after the color change.
Independent variable: Dependent variable:

IV scale: DV scale:

2. A developmental psychologist is testing the hypothesis that 6 y old children know more words in the English language than 5 y old children. To test this, she sits in on two classes (one first grade, the other Kindergarten) and counts the average number of words children in each class speak. She then compares the counts.
Independent variable: Dependent variable:

IV scale: DV scale:

3. A clinical psychologist hypothesizes that people who have been diagnosed as having major depression will be more likely to also be diagnosed with an anxiety disorder than will people who have not been diagnosed with major depression. To test this, he gives a survey to 100 people being treated for depression and 100 people with no known mental disorder. The survey asks them to report whether or not they have been diagnosed as having an anxiety disorder.
Independent variable: Dependent variable:

IV scale: DV scale:

4. A pharmacologist is testing whether a new anti-anxiety medication, Moodcor, will cause people to gain weight. To test this, she gives 100 people Moodcor for one month and 100 people a placebo drug. At the end of the month, she monitors any weight gain.
Independent variable: Dependent variable:

IV scale: DV scale:

5. A developmental psychologist believes that if children successfully lie to their friends, they will be more likely to try lying to their parents. To test this hypothesis, he asks 50 children to report how many times in the last month they have lied to their friends, and whether they were successful. He then asks them how many times they have lied to their parents.
Independent variable: Dependent variable:

IV scale: DV scale:

6. A personality psychologist believes that people who are more aggressive are more likely to purchase sports coupes than people who are less aggressive. To test this, he visits local car dealerships and asks car shoppers to rank their aggressiveness. Then, he observes what types of cars they purchase (sports coupe, sedan, SUV, or pickup).
Independent variable: Dependent variable:

IV scale: DV scale:

7. A clinical psychologist hypothesizes that listening to an inspirational tape will lead one to be in a better mood. To test this, she has 50 people listen to an hour-long inspirational tape. Another 50 listen to white noise for an hour. She then has them rate their mood on a 10-point scale.
Independent variable: Dependent variable:

IV scale: DV scale:

8. A director of residential living on a large university campus is concerned about the large turnover rate in resident assistants. In recent years many resident assistants have left their positions before completing even 1 year in their assignments. The director wants to identify the factors that predict commitment as a resident assistant (defined as continuing in the position a minimum of 2 years). The director decides to assess attitude ability to handle conflicts (measured by a standardized test) as predictors for commitment to the position
Independent variable: Dependent variable:

IV scale: DV scale:

9. Students who know their IVs from their DVs do better on weekly quizzes.
Independent variable: Dependent variable:

IV scale: DV scale:

10. Recent reports that looked at the connection between heat and violence indicate that as temperature rises the number of players hit by a pitch in a MLB games increases.
Independent variable: Dependent variable:

IV scale: DV scale: