Exam 1

1. Metainformation

   Tag	Value
   file	Descriptive-statistics_uva-variance-237-en_uva-variance-237-en
   name	uva-variance-237-en
   section	Descriptive statistics/Summary Statistics/Measures of Spread/Variance
   type	schoice
   solution	TRUE, FALSE, FALSE
   Type	Calculation
   Language	English
   Level	Statistical Literacy
   IRT-Difficulty	3.661
   p-value	0.1774

   Question

   In two random samples from a normally distributed population (n₁ = 10 and n₂ = 30) one finds S₁² = 50 and S₂² = 40. A weighted estimate of the population variance σ² then has the value

   
   
   1. TRUE: 42.37
   2. FALSE: 45
   3. FALSE: 47.63
   
   
   1. 42.37: Correct
   2. 45: Incorrect
   3. 47.63: Incorrect