Exam 1

1. Metainformation

   Tag	Value
   file	Inferential_Statistics_vufsw-confidence_intervals-1128-en_vufsw-confidence_intervals-1128-en
   name	vufsw-confidence intervals-1128-en
   section	inferential statistics/confidence intervals
   type	schoice
   solution	FALSE, TRUE, FALSE, FALSE
   Type	conceptual
   Program	NA
   Language	English
   Level	statistical literacy

   Question

   22 randomly selected German journalists (group 1) and 20 randomly selected Argentinian journalists (group 2) were asked to assess the quality of the German football team. The response scale ranges from 0 (very bad) to 10 (very good). The (fictitious) results show that the German group gives an average of 8.3 and the Argentinian group an average of 7.9. A researcher wants to check whether the assessment differs significantly between both groups. It calculates the 95% confidence interval of the difference in averages, μ1- μ2. This interval appears to be (0.15, 0.65).

   The researcher concludes that the assessments of the two groups differ significantly from each other. What can this be derived from?

   
   
   1. FALSE: The critical t-value in a two-way test with significance level = 0.05 and df = 40 is 2.02. This number is outside the interval.
   2. TRUE: The number 0.00 is outside the interval.
   3. FALSE: The number 0.05 is outside the interval.
   4. FALSE: The number 0.95 is outside the interval.
   
   

   Solution

   The number 0.00 is outside the interval, therefore you can conclude that the assessments of the two groups differ significantly from each other

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