Exam 1

1. Question

   For the 49 observations of the variable x in the data file boxhist.csv draw a histogram, a boxplot and a stripchart. Based on the graphics, answer the following questions or check the correct statements, respectively. (Comment: The tolerance for numeric answers is $\pm0.8$, the true/false statements are either about correct or clearly wrong.)

   
   
   1. The distribution is unimodal. / The distribution is not unimodal.
   2. The distribution is symmetric. / The distribution is right-skewed. / The distribution is left-skewed.
   3. The boxplot shows outliers. / The boxplot shows no outliers.
   4. A quarter of the observations is smaller than which value?
   5. A quarter of the observations is greater than which value?
   6. Half of the observations are smaller than which value?
   
   

   Solution

   
   

   
   
   1. False / True
   2. True / False / False
   3. False / True
   4. 2.55
   5. 13.1
   6. 10.4