Exam 1

1. Metainformation

   Tag	Value
   file	Descriptive-statistics_uva-correlation-898-en_uva-correlation-898-en
   name	uva-correlation-898-en
   section	Descriptive statistics/Summary Statistics/Bivariate statistics/Correlation
   type	schoice
   solution	TRUE, FALSE, FALSE
   Type	Conceptual
   Language	English
   Level	Statistical Literacy
   IRT-Difficulty	3.264
   p-value	0.247

   Question

   In a study examining the relationship between attending a statistics college (x) and developing psychosis (y), a correlation of r = 0.20 was found. This can be interpreted as

   
   
   1. TRUE: A 4% decrease in errors of predicting y with x.
   2. FALSE: A 20% decrease in errors of predicting y with x.
   3. FALSE: That for 20% of all y, prediction ($\hat{y}$) = y.
   
   
   1. A 4% decrease in errors of predicting y with x.: Correct
   2. A 20% decrease in errors of predicting y with x.: Incorrect
   3. That for 20% of all y, prediction ($\hat{y}$) = y.: Incorrect