For each of the scenarios, answer the following: 1. What are the variables of in
ID: 3485920 • Letter: F
Question
For each of the scenarios, answer the following:
1. What are the variables of interest in this study? If the study is an experimental one, identify which variable is the IV and which variable is the DV.
2. What do you think the researcher's hypothesis was?
3. Based on your answer to question 2, what should the null and alternative hypotheses be?
4. Based on your answer to question 2, which statistical test would you use to address this hypothesis? Explain your reasoning.
Some TV viewers complain to that Jeremy Clarkson's "Top Gear" is a bad influence on young drivers, given that it makes speeding and reckless driving appear "cool." To determine whether there is any foundation to these claims, a researcher uses a speed camera to measure the speeds of 400 drivers on a highway the morning before a new episode of "Top Gear" airs. He follows this procedure again, the morning after the new episode of "Top Gear" has aired. Each car is photographed, so that the experimenter can include only drivers who travelled this highway on both days (i.e., who had their speed measured twice).
The experimenter subtracts each driver's first speed reading from their second, to get a "difference score": a positive score means a driver drove faster on the second day, and a negative score means they drove more slowly. The selected drivers are then contacted and asked whether or not they had watched "Top Gear" that week.
Explanation / Answer
1. The variables of interest are television episode content and driving speed.
IV: Television episode content
DV: Driving speed
2. The researchers hypothesis would be that television episode content is associated with an increase in driving speed.
3. H0: Television episode content has no association with driving speed.
H1: Television episode content is associated with an increase in driving speed.
4. The statistical test that can be used for this study is point biserial correlation, as driving speed is a continuous variable whereas watching the episode is a categorical variable. Using this statistics, the correlation between the variables can be determined.
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