Practice Quiz 12.1 and 12.2 AP Statistics
The amount of lead in a certain type of soil, when released by a standard extraction method, averages
86 parts per million (ppm). A new extraction method is tried on 40 specimens of the soil, yielding a
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
16 - x2
- cos t
16 - sin2 t
cos t (16 - sin2 t)