Repeated Medical PG Question- 91

#PSM(INI-CET)

Using a new technique, Hb was estimated in a blood sample. The test was repeated for 10 times. The reports were : 9.5, 9.2, 9.4, 9.6, 9.7, 9.9, 10.2, 10.3, 10.5, 12.1. Accurate value of Hb was estimated by standard tests to be 10.2. The new technique has ?

A. High validity and high reliability

B. Low validity and low reliability

C. High validity and low reliability

D. Low validity and high reliability

Correct Answer- B. low validity and low reliability 

Validity (Accuracy):

▪️The validity of a test is the extent to which it accurately measures ich it purports to measure. In other words its the ability to show which individuals have the disease in question and which do not. 

▪️Validity has two components sensitivity & specificity. To be truly valid, a test should be highly sensitive, specific and unbiased.

▪️ In this question the test results are not accurate (accurate v 10.2) Test has low validity. 

Reliability (or Repeatability. reproducibility or precision)

▪️Reliability or precision or repeatability is the level of agreement between repeated measurements of the same variable i.e. a highly reliable test must give consistent results when repeated more than once on the same individual or material, under the same conditions.

Q- A Doctor is teaching an Intern about Knee reflex demonstration. What type of learning in this?

          A. Cognitive learning

          B. Affective learning

          C. Psychomotor learning

          D. None of the above

Answer is C. Psychomotor learning

▪️Learning is defined as any relative permanent change of behaviour due to learning and pratice.

▪️Learning is basically of 3 types :

1. Cognitive Learning- associated with Knowledge 

2. Affective learning - associated with Attitude

3. Psychomotor Learning - associated with Skills