Update _07-ex-model-slr.qmd (#321)

1.  **Partners' ages.** 
As previously stated, it is an impossible situation.  As I read it, *all* people can't date people 3 years younger than themselves, since you can't both date someone younger than yourself and be younger than the person dating you.

exercises/_07-ex-model-slr.qmd

@@ -323,13 +323,13 @@ Temperature is measured in degrees Fahrenheit (F) and age is measured in weeks.^
     c.  The correlation between temperature in F and age in weeks was $r=-0.70$. If we converted the temperature to C and age to months, what would the correlation be?
 
 1.  **Partners' ages.** 
-What would be the correlation between the ages of partners if people always dated others who are 
+What would be the correlation between the ages of dating partners if
 
-    a.  3 years younger than themselves?
+    a.  the older partner always dated others who are 3 years younger than themselves?
 
-    b.  2 years older than themselves?
+    b.  the younger  partner always dated others who are 2 years older than themselves?
 
-    c.  half as old as themselves?
+    c.  the older partner always dated others who are half as old as themselves?
 
 1.  **Graduate degrees and salaries.** 
 What would be the correlation between the annual salaries of people with and without a graduate degree at a company if for a certain type of position someone with a graduate degree always made