A new method of measuring Haemoglobin levels has been developed. Ten successive readings of a single sample are as follows: 9.4, 10.4, 9.6, 9.1, 10.8, 12.1, 10.1, 9.8, 9.2, 9.5. But the Haemoglobin measured by standard calorimetry was 10.2. Therefore the given method has

Reliability is precision (repeatability) and Validity is accuracy (close to true/actual value) In the given question, 10 successive readings are all different and they have a mean value of 9.4+10.4+9.6+9.1+10.8+12.1+10.1+9.8+9.2+9.5/10 = 10.0 Thus it has low reliability (non-consistent) and high validity (close to true/actual value of 10.2)