Precision and Accuracy

Q.

The students are given a vernier calipers to measure the outer diameter of a cylinder. The actual outer diameter is 4 cm. The measurements made are given in the following table:
$\begin{array}{cccccc}Student& Measurements& & & & \\ & 1& 2& 3& 4& 5\\ A& 4& 4& 4& 4& 4\\ B& 3.5& 3.6& 3.7& 3.8& 3.65\\ C& 3.7& 3.9& 4.1& 4.3& 4\\ D& 3.6& 4.2& 4.4& 4.8& 4.25\\ E& 4.005& 3.995& 4.05& 3.95& 4\end{array}$

In case B, the measurements are said to be:

1. Highly Accurate

2. Highly Precise

3. Both a & b

4. none

Q.

The students are given a vernier calipers to measure the outer diameter of a cylinder. The actual outer diameter is 4 cm. The measurements made are given in the following table:
$\begin{array}{cccccc}Student& Measurements& & & & \\ & 1& 2& 3& 4& 5\\ A& 4& 4& 4& 4& 4\\ B& 3.5& 3.6& 3.7& 3.8& 3.65\\ C& 3.7& 3.9& 4.1& 4.3& 4\\ D& 3.6& 4.2& 4.4& 4.8& 4.25\\ E& 4.005& 3.995& 4.05& 3.95& 4\end{array}$

1. In case A, the measurements are said to be:

1. Accurate

2. Precise

3. Both a & b

4. none