Reason About Data and Draw Conclusions From Them Practice Test

A study examined how alveolar ventilation affects arterial CO$2$ partial pressure ($P{aCO_2}$) in a controlled setting.

Table: Ventilation vs $P_{aCO_2}$

Ventilation (L/min): 3, 4, 5, 6, 8

$P_{aCO_2}$ (mmHg): 55, 46, 40, 35, 28

Which conclusion is most supported by the data?

A physics-based model of ultrasound imaging predicts that echo intensity increases with acoustic impedance mismatch between tissues. A lab measured reflected intensity at a boundary for different impedance ratios $Z_2/Z_1$.

Table: Impedance ratio vs reflected intensity

$Z_2/Z_1$: 1.0, 1.2, 1.5, 2.0, 3.0

Reflected intensity (%): 0, 1, 4, 11, 25

Which conclusion is most supported by the data?