This table shows the numbers of collegeaged and other Americans, in millions, who did or did not have health insurance in 2002.
![743_numbers of collegeaged and other Americans.png](https://secure.tutorsglobe.com/CMSImages/743_numbers of collegeaged and other Americans.png)
a. Is the explanatory variable shown in the rows or in the columns of this table?
b. Suppose a claim is made that collegeaged Americans are twice as likely to be uninsured (for health) as others. State the relevant probabilities.
c. Tell whether or not the claim mentioned in part (b) is justified.