Factors Affecting Choice of Statistical Test

• What are the 3 factors affecting the choice of statistical test?


  The design of the study

  The level of data

  Whether a difference/ correlation is being measured
• What is meant by the design of the study in terms of the factors affecting the choice of tests?


  If it involved an unrelated design - independent groups

  Or if it involved a related design - repeated measures or matched pairs design
• what is meant by the level of data in the factors in choosing a statistical test?


  ordinal/nominal/interval
• Draw the statistical test table? 


  this

  
• what is the acronym used to remember the statiscal tests? 


  Carrots Should Come

  Mashed With Swede

  Under Roast Potatoes
• What are statistical tests used for? 


  To determine whehter a significant difference/ correlation exists, discovered using the calculated value and the critical value
• Define calculated value?


  The result obtained from the statistical test
• Define critical value?


  the numerical boundary that stands between accepting/ rejecting the null hypothesis when a hypothesis is being tested
• How is the critical value worked out?


  From a table of probability values depending on factors:

  • if it was a one/two tailed test
  • the P value
  • either the N value or degrees of freedom value
• What is meant by the rule of R? 


  If there is an R in the name of the statistical test, the calculated value has to be gretaer/ equal to the critical value for the result to be significant
• what happens if the result is significant?


  The null hypothesis can be rejected and alternative hypothesis is supported
• What happens when there is no R in the test's name?

  the calculated value has to be less than/ equal to the critical value for it to be significant