random tings
randoms tings
- Created by: Jamie
- Created on: 02-06-11 18:35
Section 2 - Experiments
Lab experiment: A;can lead to cause and effect being established. D;demand characteristics
Field experiment: A;greater ecological validity as it is done in the ppt natural environment. D;difficult to control variables
Natural experiment: A;greater ecological validty than both above as it occurs naturally. D;difficult to control variables
Questionnaire: A;easy to replicate once written. D;does not gather in depth info if questions are close ended.
Interview: A; flexible and sensitive to the ppt responses D;more time consuming to carry out therefor no good for groups
Section 2 - Experiments
Observational study: A; Behaviour is naturally occuring therefor has high ecological validity. D; extraneous variables difficult to control.
Corelational study: A;provide valuable info on strength of a relationship between two variables. D;unknown vairable maybe influencing correlation.
Case study: A;generates good in depth qualitative data providing reasons for things. D;cases usually unique so reliability cannot be assesed by replication.
Section 2 - Reliability
Extent to which the study is consistent/weather the same findings can be found
Test-retest reliability: Where the test is carried out on two seperate occasions and results are compared
Split half method: Half of the questions correlated to the other half of questions and high corrrelation means high reliability
Inter rater reliability: consistency of observers/when 2 or more people are observing the same thing and if correlation is high Observer reliability is acheived.
Section 2 - Validity
The extent to which something measures what it claims too
Experimental: is the manipulation of one variable really causing a change in another
Ecological: Can the findings or effects observed be generalised from the experiment to real life
Content: to ensure the content of the experiment is a representation of the area
Concurrent: Assess a new test with an old one which has already deemed to be valid and if they perform simular the new test is valid
Construct: weather what it is measuring matches an underlying construct
Section 2 - Sampling
Random: A;Produces unbiased sample as there is no personal selection. D;Is time consuming as the process takes time.
Self selecting: A;quick and easy to gain a sample this way. D; Ppt has special characteristics as they have been able to volunteer.
Systematic: A;Easy once the sampling frame has been gained. D;Every person does not stand an equal chance of being picked.
Opportunity: A;Quick and easy as the researcher uses the first person they find. D;Technique produces very biased sample as they have been directly chosen by the researcher.
Section 2 - Sampling
Stratified: A;Sample is gained in proportion to the population so is representative. D;Proportions must be already known in order to be calculated e,g; gender balance race balance etc.
Quota: A;Sample gained is in proportion to the population. D;Proportions must be already known in order to be calculated e,g; gender balance race balance etc.
Section 2 - Ethics
Consent: ppt should be fully informed about the experiment in order to make an informed decision therefor does not occur where it needs to be secret.
Deception: Missinformed about experiment.
Withdrawl: Ppt should be told they have the right to withdrawl from the investigation
Confidentiality: Information should be kept between the ppt and researcher
Protection: ppt should be protected from physical or physiological damage/harm.
Debreifing: At the end of the study information should be past on about the study such as finding results any information that was left out throughtout the investigation.
Section 2 - Averages
Mode: A;Not influenced by extreme results. D;Not useful if there are many equal modes.
Median: A;Not distorted by extreme values D;Less sensitive measure of central tendancy.
Mean: A;Most sensitive measure of central tendancy as it sits at the center of all deviations. D;can be distorted by extreme variables.
Range: A;Quick and easy to calculate. D;distorted by extreme variables
Bar Charts: A; Allows visual display of nominal level data. D;Can only be used with discrete data.
Section 2 - Averages
Histograms: A;Allows visual display of interval/ratio data. D;More difficult to compare two data sets.
Scatter graphs: A;Demonstrates range and outliers as best fit can be drawn. D;No cause and effects can be determined between the 2 variables.
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