Exam 1

1. Metainformation

   Tag	Value
   file	Inferential_Statistics_vufsw-confidence_intervals-1246-en_vufsw-confidence_intervals-1246-en
   name	vufsw-confidence intervals-1246-en
   section	inferential statistics/confidence intervals
   type	schoice
   solution	FALSE, TRUE, FALSE, FALSE
   Type	conceptual
   Program	NA
   Language	English
   Level	statistical literacy

   Question

   A researcher wants to check whether the average atmosphere during Ajax matches differs significantly from the atmosphere at Feyenoord matches. He counts the number of incidents (instances of misconduct by supporters) during 16 matches of both clubs: at Ajax the average number of incidents per game is 1.95 and at Feyenoord this is an average of 1.70. The researcher then calculates a 95% confidence interval of the difference between the two means, μ Ajax -– μ Feyenoord. This interval appears to be (-0.25, 0.72)

   The researcher concludes that the atmosphere between the matches of both clubs does not differ significantly from each other. What can this be derived from?

   
   
   1. FALSE: The critical t-value for a two-tailed test with alpha = 0.05 and df = 30 (16 + 16 - 2) is 2.042. This number is outside the interval.
   2. TRUE: The number 0 is within the interval.
   3. FALSE: The number 0.05 is within the interval.
   4. FALSE: The number 0.95 is outside the interval.
   
   

   Solution

   The number 0 is within the interval, thus the atmosphere between the matches of both clubs does not differ significantly from each other..

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