Exam prep Flashcards
Hypothesis
A supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation
Replicate
make an exact copy of; reproduce
Survey
Study in which a group of participants is selected from a population and data about or opinions from those participants are collected, measured, and analyzed
- Information is obtained by asking individuals a fixed set of questions
- Two types include interview and questionnaire
E.G. Questionnaire provided to new parents asking questions about their parenting practices and their child’s behaviour
Pros
- Practical
- Time efficient
- Can obtain uniform results
- Questionnaire limit researcher influence
Cons
- interviews can result in misleading answers
- must ensure that questionnaires accurately examine the intended subject
- requires trust of the participant
Target Population
The population that a study is intended to research and to which generalizations from samples are to be made
Sample
A subset of a population of interest that is selected for study with the aim of making inferences to the population. It is important to ensure that a sample is representative of the larger population.
Random Sample
selecting participants without any sort of characteristics, or qualifiers as criteria. All people in the population are equally as likely to be selected
Stratified Sample
purposely selecting participants that proportionately represent subgroups found within the population (age, location, gender, religion, education)
E.G. Total
School population
Grade 9s: 600/2121 = 28%
Grade 10s: 521/2121 = 25%
Grade 11s: 603/2121 = 28%
Grade 12s: 397/2121 = 19%
Data collected
Grade 9s: 28/100 = 28%
Grade 10s: 25/100 = 25%
Grade 11s: 28/100 = 28%
Grade 12s: 19/100 = 19%
Volunteer Bias
Volunteer bias (also called self-selection bias) arises in any research study in which participants choose if they want to be part of the sample
Case study
- intensive investigation of one or more participants (person, group, community)
- a combination of methods is used including: long term observation, diaries etc
E.G. Jeremy has a fear, psychologist has him keep a diary of his experiences, and collects a detailed account of his childhood
Pros - can gather a full history of a person
- serves as the basis for new hypothesis that could be tested in controlled situations
Cons
- cannot be used to make conclusions on its own
- results are individual and cannot be generalized
Longitudinal Method
- Data collected about a group of participants over a long period of time, at regular intervals
- Used to determine the progression or development of various characteristics
E.G. Psychologist studying whether personality is fairly stable or unstable examines the same group of children from age 1-25
Pros
- Good format to study consistencies and inconsistencies in behaviour
Cons
- Time consuming
- Expensive
- May lose track of participants which can affect results
Cross-sectional Method
Participants organized into groups based on age, and studied so that age related differences can be compared
E.G. psychologist wanting to study short term memory capacity provide children ages 5, 10, 15 with a series of words and ask them to recall the list
Pros
- less expensive than longitudinal
- no risk of losing participants
- shorter time span for results
Cons
- Results could be attributed to differences other than age
Naturalistic Observation
Researcher watches and records activity of subjects in their natural environment while avoiding interference
E.G. watch monkey learn to use rock
Pros
- Learns naturally thru watching
Cons
- Researcher’s presence could taint results
Correlation
- Mutual relationship or connection between two or more things.
- Just because there is a relationship between 2 things does not mean one thing CAUSES another to happen.
Positive correlation
On a graph, the line is going up(left to right)
In text, both factors increase or decrease.
E.G.
- As number of cats go up, happiness increases
- As number of legs goes down, ability to walk goes down
Negative correlation
On a graph, the line is going down (left to right)
In text, as one factor increases (free time) another factor decreases (stress)
Experiment
- utilizes the scientific method to investigate a question and test a hypothesis
- the hypothesis outlines the variables (conditions, behaviours subject to change)
E.G. The ability for students to concentrate as the temperature increases
Pros
- High control over the situation
- Decrease interference from outside variables
Cons
- research questions require additional experiments in order for results to be replicated before conclusions/theories can be accepted
- can be difficult to limit the influence of hidden flaws
- can be difficult to decide on the best independent/dependent variables to answer a question
Control variable
All other factors that are kept the same
Independent variable
The condition that the experimenter changes
Dependent variable
Condition that varies as a function of the independent variable (dependent on the independent)
Experimental group
Group of participants in a research study who are exposed to a particular manipulation of the independent variable
Control group
Not assigned any manipulatable conditions
Controlled experiment
A controlled experiment is an experiment in which all the variable factors in an experimental group and a comparison control group are kept the same, except for one variable factor in the experimental group that is changed
Placebo
refers to a treatment that appears real, but is designed to have no physical benefit but can alter brain thinking. A placebo can be a sugar pill, a water or salt water (saline) injection or even a fake surgical procedure
Single-blind study
the researcher is aware of who has the placebo