Exam 1

1. Metainformation

   Tag	Value
   file	Inferential_Statistics_vufsw-chi-squared-1129-en_vufsw-chi-squared-1129-en
   name	vufsw-chi-squared-1129-en
   section	inferential statistics/nhst/test statistic/chi-squared
   type	schoice
   solution	FALSE, FALSE, TRUE, FALSE
   Type	test choice
   Program	NA
   Language	English
   Level	statistical literacy

   Question

   Is alcohol consumption at the age of 16 dependent on the socio-economic status (low, middle, high) of their parents? A study of 150 16-year-olds gives the following data:

   	socio-economic status parents
   	low	middle	high	total
   alcohol consumption
   no	22	52	16	90
   yes	23	23	14	60
   total	45	75	30	150

   To answer the research question which test should be used with how many degrees of freedom?

   
   
   1. FALSE: A t-test with 2 degrees of freedom
   2. FALSE: A t-test with 149 degrees of freedom
   3. TRUE: A chi-square test with 2 degrees of freedom
   4. FALSE: A chi-square test with 149 degrees of freedom
   
   

   Solution

   Here you have a categorical association. The test you have to do is the chi-square test, a t -test is for comparing two groups, here you have a categorical association.

   Degrees of freedom= (number of rows-1)(number of columns-1) = (2-1)(3-1)=1*2=2.

   If you want to know more about categorical associations watch this clip

   If you want to know more about the chi-square test and degrees of freedom watch this clip

   Levels of Difficulty
   Difficult

   M&T Model selection
   Default value

   M&T Non-parametric test
   Default value

   
   
   1. False
   2. False
   3. True
   4. False