Question

7. Valeria is a civil engineer, and she is measuring the tensile

strength of a new type of steel. The actual strength of the new
steel is 55, 400 pounds per square inch (psi). She performs
three tests on the steel, and measures the following values:
58, 895 psi, 58, 880. psi, and 58, 884 psi. Which of the following
statements describes Valeria's measurements.
neither accurate nor precise
precise, but not accurate
accurate, but not precise
both precise and accurate

Answer 1

Valeria's measurements of the tensile strength of the new type of steel are both precise and accurate. Precision refers to the consistency and reproducibility of the measurements, while accuracy refers to how close the measurements are to the actual value.In this case, Valeria performed three tests and obtained measurements of 58,895 psi, 58,880 psi, and 58,884 psi. These measurements are very close to each other, indicating high precision. Additionally, the average of these measurements is 58,886 psi, which is also very close to the actual strength of the steel (55,400 psi). This indicates high accuracy.To summarize, Valeria's measurements are both precise (consistent and reproducible) and accurate (close to the actual value).