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Questions and Answers
What is the first step to determine whether a fertilizer is effective in promoting plant growth?
Determine how you will measure plant growth
Which of the following are ways to measure plant growth? (Select all that apply)
Match the type of research design to its description:
Single Group Repeated-Measures Design = Uses one group of subjects measured multiple times Two-Random-Samples Design = Uses two different groups of subjects for comparison Two-Groups & Repeated Measures = Uses two groups measured at different times with and without treatment
What is an operational definition?
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An operational definition helps researchers measure different concepts consistently.
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What is one goal of scientific research?
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Study Notes
Research Methodology in Psychology
- PSYC 200 focuses on psychology as a biological science, while PSYC 201 examines psychology as a social science.
- Experimental designs in research can involve one plant, a single group of plants, or two different groups of plants to test variables such as fertilizer effects on growth.
Measuring Plant Growth
- Plant growth can be operationally measured through various metrics:
- Increase in height
- Number of leaves
- Size and number of fruits
- Time to reach a specific size
Experimental Designs
-
Single Plant Design:
- Utilize one tomato plant
- Measure average leaf size before and after applying fertilizer
- Analyze changes in average leaf size to conclude effects
-
Single Group Repeated-Measures Design:
- One group of tomato plants
- Measure average leaf size before and after fertilization
- Compare leaf size changes over time
-
Two-Random-Samples Design:
- Group A: No fertilizer
- Group B: Fertilizer applied
- Compare average leaf sizes between the two groups after 10 days
-
Two-Groups & Repeated Measures:
- One random sample for each group measuring average leaf size before treatment
- Apply treatment and measure average leaf size afterward
- Analyze changes to determine fertilizer effects between groups
Choosing Experimental Design
- Selecting an experimental design depends on the research question and the feasibility of the study.
- Each design has advantages and disadvantages in terms of control, clarity, and data comparability.
Goals of Scientific Research
- Three primary goals:
- Description of phenomena
- Explanation of findings
- Prediction of future behaviors or outcomes
Operational Definitions
- Essential for qualitative concepts to make them measurable quantitatively.
- Examples from other sciences:
- Physics defines velocity as Distance/Time.
- Density as Mass/Volume.
- In psychology:
- Short-term memory capacity measured by the number of chunks recalled.
- IQ calculated using (Mental Age/Chronological Age) X 100.
Importance of Operational Definitions
- Standardizes abstract concepts to ensure consistency in research communication.
- Necessary for different research studies to align on the same terminology, allowing for accurate comparisons and measurements.
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Description
Dive into the fundamentals of research methodology in PSYC 200. This quiz challenges you to explore how to measure plant growth effectively and define operational terms in research. Perfect for students looking to solidify their understanding of scientific methods in psychology.
