Test Device Performance Practice Test

A nurse tests a disposable cold pack.

Criterion: The cold pack must reach 0–5°C within 2 minutes and stay cold for 30+ minutes (stays at or below 10°C for at least 30 minutes). Test procedure: Activate the pack and record temperature with a thermometer. Data (time | temperature): 0 min|22°C, 1 min|9°C, 2 min|6°C, 5 min|4°C, 10 min|3°C, 20 min|6°C, 30 min|11°C, 35 min|13°C.

Which statement best evaluates the cold pack against the criteria?

A student tests an insulated container using two criteria:

Criterion 1 (temperature): Keep the liquid above $60^\circ\text{C}$ for 4 hours.

Criterion 2 (cost): Materials cost must be $\le\$10.

Test procedure: Pour $80^\circ\text{C}$ water into the container and measure temperature hourly; add up material costs from receipts.

Data: Temperatures (hours 0 to 4): 80, 73, 67, 64, 61. Total cost: $\$12.

How should the student evaluate this design?