Our World Statistics Day conversations have been a great reminder of how much statistics can inform our lives. Do you have an example of how statistics has made a difference in your life? Share your story with the Community!

Siblings Case Study

The Siblings case study and data sets.


Download the case study
Download the data set - 1
Download the data set - 2

One Sample t Confidence Interval:

Using data from a survey of students, estimate the average number of siblings for the general population.  Key ideas: Logarithmic transformation, inverse transformation, mean versus median, power, robustness of t procedures, sampling distribution.

JMP features demonstrated

Analyze > Distribution, Formula Editor, transforming in Graph Builder

Statistical/graphical tools used:

Histograms, normal quantile plots, log transformations, confidence intervals, inverse transformation.


Statistics case studies provided by Dewayne Derryberry of the Math Department at Idaho State University.