Exam 1

1. Metainformation

   Tag	Value
   file	Descriptive-statistics_uva-correlation-900-en_uva-correlation-900-en
   name	uva-correlation-900-en
   section	Descriptive statistics/Summary Statistics/Bivariate statistics/Correlation
   type	schoice
   solution	FALSE, FALSE, TRUE
   Type	Conceptual
   Language	English
   Level	Statistical Literacy
   IRT-Difficulty	3.602
   p-value	0.1857

   Question

   In a study examining the relationship between attending a statistics college (x) and developing psychosis (y), a correlation of r = 0.50 was found. This can be interpreted as

   
   
   1. FALSE: A 50% decrease in errors of predicting y with x.
   2. FALSE: That for 50% of all y, prediction ($\hat{y}$) = y.
   3. TRUE: A 25% decrease in errors of predicting y with x.
   
   
   1. A 50% decrease in errors of predicting y with x.: Incorrect
   2. That for 50% of all y, prediction ($\hat{y}$) = y.: Incorrect
   3. A 25% decrease in errors of predicting y with x.: Correct