knowversePsychological research uses structured methodologies to avoid common thinking traps. Empirical controls allow researchers to separate actual causes from mistaken assumptions.
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Hindsight bias is the tendency to view an outcome as obvious or foreseeable after it has already occurred.
This tendency to believe, after learning an outcome, that you would have foreseen it is known as hindsight bias.
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A hypothesis is a testable prediction produced by the underlying logic of a theory.
A hypothesis is a testable prediction, usually derived directly from the logic of the theory.
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Operational definitions specify measurement or manipulation procedures clearly enough for other researchers to understand and attempt to repeat them.
To solve this, researchers use an operational definition, which is a carefully worded statement of the exact procedures used in a study.
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Random sampling ensures that every individual in the target population has an equal likelihood of being included.
To make the sample fair, scientists use a random sample, where every member of the population has an equal chance of being picked.
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A positive correlation occurs when two variables move in the same direction, whether both increase or both decrease.
In both cases, the variables are 'teaming up' and moving together, whether they are both going up or both going down.
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Manipulation with appropriate controls helps test causal hypotheses. A correlation study records associations without that experimental manipulation.
The specific factor that the researcher chooses to change or control is called the independent variable.
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The independent variable is the factor directly controlled or manipulated by the researcher.
One group is told to sleep for 8 hours, while another group is woken up after only 4 hours. The amount of sleep is the independent variable here.
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Random assignment helps balance participant differences on average. Chance differences can remain.
To prevent this, researchers use random assignment, which means placing participants into groups purely by chance.
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In a double-blind design, both participants and research staff remain uninformed about treatment assignments to prevent bias.
In a double-blind procedure, both the participants and the research staff are ignorant about who received the real treatment and who received the placebo.
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Debriefing explains the study after participation, including its purpose and any deception, rather than being a substitute for consent beforehand.
Debriefing is the post-experimental explanation where the researcher reveals the true purpose of the study.
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Hindsight bias makes a known outcome feel predictable after the fact. Overconfidence can make a judgment seem more accurate than it is. Psychological research tests claims instead of relying on those feelings. A theory organizes explanations, while a hypothesis states a prediction that observations can support or challenge.
An operational definition states how a concept will be measured or manipulated in a study. That detail helps other researchers understand and repeat the procedure. Sampling concerns who enters a study. A simple random sample gives each member of the defined population an equal chance of selection, unlike recruiting whoever is easiest to reach.
This tendency to believe, after learning an outcome, that you would have foreseen it is known as hindsight bias.
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Correlation describes how variables vary together. A positive correlation means their values tend to move in the same direction, even when both decrease. Correlation alone does not establish causation. Another variable may influence both, or the direction of influence may differ from the explanation a researcher first considers.
In a controlled experiment, the researcher manipulates an independent variable and measures a dependent variable. Random assignment reduces systematic differences between groups on average, without guaranteeing identical groups. Blinding can limit expectations influencing results. Participants also need ethical safeguards, and debriefing explains the study after participation, including any deception that was used.
The specific factor that the researcher chooses to change or control is called the independent variable.
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Sources: Scientific Logic in Psychology. Each question or step includes an excerpt from the course.
