ch 1- scientific investigation, planning, ethics and safety Flashcards
investigation aim
the purpose of a study
investigation question
the question that is to be solved by a study
hypothesis
a statement predicting the probable outcomes of a study
independent variable
the variable that is being manipulated by the researcher
dependent variable
the variable that is being measured by the researcher
extraneous variable
a variable other than the independent variable that may have an unwanted effect on the dependent variable and results of an investigation
controlled variable
held constant to ensure that the only influence on the dependent variable is the independent variable
confounding variable
an unwanted variable that has affected the results of an investigation
population
the wider group of people that a study is investigating
sample
the smaller group of people selected from the population who will be participants in the investigation
sampling technique
involves procedures for selecting participants from the population
random sampling
selecting participants from the population in a way that means each member of the population has an equal change of being selected to participate in the study
stratified sampling
first dividing the population into subgroups and then randomly selecting participants from each subgroup in the proportion that they appear in the population
investigation methodology
particular type of research study
allocation
dividing a sample into groups in an investigation
random allocation
dividing a sample into groups in a way that each participants has an equal chance of being placed into the experimental group or the control group
experimental group
the group that is exposed to the independent variable and receives the experimental tratment
control group
the group that forms a baseline level to compare with the experimental group
investigation design
a framework that determines how participants experience the experimental and control conditions