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The Scientific Method
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Theory Hypothesis Research Support the theory OR Refute/Fail
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Explanation based on observations How a phenomenon (observable thing) works Interconnected ideas/concepts Used to explain prior observations or make predictions about future events
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Prediction based on a theory Specific, testable Outcome should support the theory
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Collection of data Objective information/measurements
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Theory Alcohol impairs driving ability Hypothesis People who consume alcohol tend to display poorer coordination and motor skills than those who don’t Research Observed two groups – one drinks alcohol, the other doesn’t Analyze data Use statistical techniques
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Something that can vary that the researcher can measure or manipulate For the previous study some variables would be: Amount of alcohol consumed Level of intoxication Coordination Motor control Balance
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Identifying variables so they can be measured Coordination How easily people can touch their fingers to their nose with their eyes closed? The number of inches by which they miss by
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Descriptive Longitudinal Cross-Sectional
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Observational Observing and noting behavior Analyzing behavior objectively Two types of observation: Naturalistic Observer is separate from the situation Participant Becomes one of the participants
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Examine change over time Study or follow the same participants multiple times over a period of time Advantages: Provide info. about the effects of age on the same people Disadvantages: Expensive Takes a long time May lose participants over time
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Compares participants in different groups at the same time Advantages: Quick and less expensive Disadvantages: Unidentified variables may be involved
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Observer (experimenter) Bias Participant Bias
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Tendency or inclination Prevents unprejudiced consideration of a question or idea
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Errors in observation that occur because of an observer’s expectations A study was conducted on male and female facial expressions when viewing a slide show The study was trying to prove that men and women show the same emotional expression If the observer believes women are more emotional than men, he/she may always observe emotional expressions on women and not on the men
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When a person in a study knows what the observer is looking for they may change their behavior to fit the observer’s expectancy Sometimes done on purpose Sometimes unintentional
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How variables are naturally related Does not show causation Amount of alcohol available in a community and the likeliness of car accidents Advantages: Rely on naturally occurring relationships Take place in real world settings Disadvantage Cannot show causal relationships Unidentified variables may be involved
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A study that tests causal hypotheses by measuring and manipulating variables
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Control Comparison group Participants who do not receive any intervention Experimental Treatment group Receive intervention
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Study on violent videos games and whether they encourage violent behavior Control Group: Plays a non-violent game Experimental Group: Plays a violent game Study on how people are affected by alcohol use Control Group: Drinks water Experimental Group: Drinks alcohol
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Independent Dependent
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Variable that is manipulated The amount of intoxication Examines the impact on the dependent variable
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Variable that is affected by the manipulation of the IV Driving performance after intoxication
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Results should generalize or apply to people beyond those in the study Sampling Process by which you select people from the population Random Sampling Represents the population Equal chance of being chosen
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Placing research participants into the conditions of an experiment in a way that each participant has an equal chance of being assigned to any level of the IV
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View behavior Write descriptions Tallies Ratings on a scale
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Intense examination of a very specific group or type of people Brain injuries Psychological disorders
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Questionnaires Surveys Disadvantages Bias Never return surveys Advantages Easily administered Mailed out Gather data from a large amount of people
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Hypothesis: Being observed can lead participants to change their behavior Independent Variables – pay incentives, break schedules Dependent Variable – speed of production RESULTS – Workers’ productivity increased when they were being observed, regardless of the change in the IV CONCLUSION: Being observed can lead participants to change their behavior because people act in particular ways to make positive impressions
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Ensure participants well being
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Strict guidelines Review all research proposals Make sure it meets scientific standards Must take into consideration ethical and safety concerns Well being of the participants
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Privacy Names are never published Access to data Only the researcher and his/her team Informed consent Overview in writing Give relevant information Have the right to know what they will experience Acknowledge their participation Signature on the form
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