Unit 5: Scientific Method & History

Answer: C — The correct answer is C because after collecting data, the next step in the scientific method is to analyze the data to identify patterns and correlations. This will help the researcher formulate a hypothesis to explain the observed shift in migration routes. Option A is incorrect because developing a hypothesis should occur after analyzing the data, not before. Option B is incorrect because publishing findings should occur after the research is complete, not in the middle of the process. Option D is incorrect because conducting a survey of other researchers is not a necessary step in the scientific method and may introduce bias into the research.

Answer: C — The correct answer, C, is the best description of the controlled environment's role in the study. The controlled environment is used to minimize the impact of extraneous variables, allowing the researcher to isolate the effect of the independent variable (higher temperatures and increased carbon dioxide levels) on the dependent variable (plant growth rate). Option A is incorrect because the controlled environment is not the experimental group, but rather a tool used to create a consistent environment for the experiment. Option B is incorrect because the controlled environment is not the dependent variable, which is the outcome being measured. Option D is incorrect because the controlled environment is not a sampling method, but rather a way to control for extraneous variables.

Answer: B — The correct answer is B because manipulating the environmental conditions to simulate the effects of climate change allows the researcher to establish a cause-and-effect relationship between the variable (climate change) and the observed changes in the bird's behavior. This is a key aspect of scientific inquiry, as it enables researchers to test hypotheses and draw conclusions about the relationships between variables. Option A is incorrect because repeating the study in a different location may provide additional data, but it does not establish a cause-and-effect relationship. Option C is incorrect because comparing the data to a similar study on a different species of bird may provide some context, but it does not address the specific research question. Option D is incorrect because discontinuing the study and publishing the results as is would not provide sufficient evidence to support a cause-and-effect relationship.

Answer: D — The correct answer is D because re-collecting data for the entire 10-year period using the new methods ensures consistency and accuracy in the data. This is necessary because changes in data collection methods can introduce biases and affect the validity of the results. Options A, B, and C are incorrect because they do not address the issue of consistency in data collection methods, which is crucial for ensuring the validity of the results. Option A may introduce biases by comparing data collected using different methods, option B discards valuable data, and option C may not fully account for the changes in data collection methods.

Answer: C — The correct answer is C because the study's limited scope (only collecting data from a single location) and failure to account for confounding variables (such as changes in food availability or habitat destruction) limit its ability to be generalized to other contexts, thereby lacking external validity. Option A is incorrect because the study's duration is not the primary limitation. Option B is incorrect because the study does not necessarily require a control group to be valid. Option D is incorrect because the study's duration is actually a potential strength, as it allows for the collection of long-term data.