Two pieces of information were gathered from 1212 randomly selected cities in the United States: the number of persons owning registered firearms and the murder rate. It was observed that cities with more registered firearms tended to have higher murder rates. Part A: Which is the population of interest in this study? People who own registered firearms in the United States Cities in the United States People who live in U.S. cities People who were murdered in the United States Part B: Which is the sample in this study? People who live in the 121U.S. cities People who own registered firearms in the 12 U.S. cities 12 cities in the United States People who were murdered in the 12 U.S. cities Part C: What type of study is this? A census, because it uses data from the entire population A statistical study, because it uses data from a sample
Two pieces of information were gathered from 1212 randomly selected cities in the United States: the number of persons owning registered firearms and the murder rate. It was observed that cities with more registered firearms tended to have higher murder rates.
Part A: Which is the population of interest in this study?
- People who own registered firearms in the United States
- Cities in the United States
- People who live in U.S. cities
- People who were murdered in the United States
Part B: Which is the sample in this study?
- People who live in the 121U.S. cities
- People who own registered firearms in the 12 U.S. cities
- 12 cities in the United States
- People who were murdered in the 12 U.S. cities
Part C: What type of study is this?
- A census, because it uses data from the entire population
- A statistical study, because it uses data from a sample
Part D: Which of the following was not a variable observed in this study?
- The number of registered firearms in a given city
- Murder rate for a given city
- Whether a person owns a firearm
Part E: Classify the following variable from this study: Murder rate.
- Categorical
- This is not a variable in this study.
- Quantitative
Part F: Classify the following variable from this study: Number of registered firearms.
- Categorical
- This is not a variable in this study.
- Quantitative
Part G: Which is the explanatory variable in this study?
- Whether a person owns a firearm
- The number of registered firearms in a given city
- Murder rate for a given city
Part H: Which is the response variable in this study?
- Whether a person owns a firearm
- Murder rate for a given city
- The number of registered firearms in a given city
Part I: Assuming that there are no errors in the information gathered in this study, would it be appropriate to conclude that a higher number of registered firearms leads to a higher murder rate for a given city?
- Yes
- No
Part J: Explain your response to Part I.
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