What Is an Example of a Problem in Which the Sample

Multiple Choice

What is an example of a problem in which the sample data is likely to be paired?

A) The difference between the means of appraised and sales house prices
B) The difference between the proportion of defective items from two suppliers
C) The difference in the mean life of two major brands of batteries
D) The difference in the mean salaries for graduates in two different academic fields at a university