View Youtube video following this link about Calculating Variance for the Sample, and a Group
Calculate The standard deviation, variance, and range for both of the variables, Exam Performance, and Exam Anxiety. Provide your output, what does it mean?
Then, based on the grouping variable, Biological Gender, select either Exam Performance or Exam Anxiety calculate the group standard deviation, the group variance, and the group range. Compare the group output to the sample output, how does the output differ.