interval data

Which statistical test will most likely be used and why?

* Matched pairs t-test: 1 nominal + 1 interval, linked

  • Husbands & wives: 1 nominal (2 non-inedependent groups)
  • Glucose ratio data: 1 interval

* Chi-square test: 2 nominal (2x3)

  • 1 nominal: Call sick VS. didn’t call sick
  • 1 nominal: 3 different shifts (3 groups)

* Pearson correlation: 2 interval

  • 1 interval: study time in hours
  • 1 interval: test scores

* t-test: 1 nominal + 1 interval

  • 1 nominal: Same-sex siblings VS non same-sex siblings (2 groups)
  • 1 interval: testosterone levels

* Two-way ANOVA: 1 interval + 2 nominal

  • 1 interval: time (faster VS not faster)
  • 1 nominal: trained VS not trained
  • 1 nominal; vacutianer VS standard syringe

* Chi-Square:  2 nominal

  • 1 nominal: margarine VS butter
  • 1 nominal: cancer VS not cancer

* One-way ANOVA: 1 nominal + 1 interval

  • 1 nominal: efficacy of qx in 3 groups (radical mastectomy VS radiation VS no tx)
  • 1 interval: quality of life measured on a 10 point scale.

*Chi-square: 2 nominals

  • 1 nominal: pass VS fail
  • 1 nominal: 3 test sites (3 groups)

* One-way ANOVA: 1 nominal + 1 interval 

  • 1 nominal: 3 test sites (3 groups)
  • 1 interval: test scores

* Matched pairs t-test: 1 nominal (linked, before and after) + 1 interval

  • 1 nominal: HTN pts 1w before & 3m after taking drug (2groups)
  • 1 interval: BP changes

Examples taken from Behavioral Sciences Kaplan Lecture Notes