week 4

• population perameters 


  describe the whole population
• sample statistics


  describe the data of the sample
• sampling errors are not present in representative samples.


  FALSE
• sampling distribution 


  values will be different based on the sample selected
• standard error of the mean

  sd / sqrt(n)
• Central limit theorum states that

  even if data is not normally distributed it will be if the sample becomes large enough
• does the experimental method avoid the third variable problem

  yes but it also decreases ecological validity
• What is a research strategy?

  strategies and broad chategories that clasify research according to how a study is conducted

  • experimental
  • nonexperimental
  • quasi-experimental
  • correlational
  • descriptive
• what is a descriptive strategy?

  does not aim to explain a relationship, simply to describe characteristics of a population
• what is an experimental strategy?

  the researcher control and manipulates certain variables to measure the DV, aims to answer a cause-and-effect question between 2 variables
• what is a correlational strategy?

  describes the relationship between 2 covariables, doesn't aim to explain it
• Explain the quasi-experimental strategy

  aims to answer cause-and-effect questions but cannot provide unambiguous anwers
• explain the nonexperimental strategy

  demonstartes a relationship without explaining the cause
• explain research design 


  how to implement the strategy, requires three decisions

  • individual vs group
  • repeated or individual methods
  • number of variables included
• describe research procedure 


  finer details of the study, determines:

  • how the variables will be manipulated / controlled / measured
  • how individuals will be involved
  • how the ppts will proceed through the course of the strategy