The scatter plot below shows the relationship between the percentage of American adults who smoke and years since 1945.

During this time period, the percentage of adults who smoked changed each year by about

Choose 1 answer
(A) -2 percentage points
(B) -1 percentage points
(C) -1/2 percentage points
(D) -1/4 percentage points

All per-unit concepts rely on ratios,meaning,to provide a type of measurement

What is the missing step in this proof ?

Kilgore trout creates a new scale to diagnose depression. however, his scale only assesses one symptom of depression while ignoring others. which of the following is his new scale most likely lacking? a) test-retest reliability b) discriminant validity c) criterion validity d) alternate-forms reliability e) content validity f) none of the above