Reliability and objectivity of the test are reported by using :

The correct answer is Interclass correlation.

Key Points

Reliability: 

• Reliability refers to the consistency of a measure.

Objectivity:

• Quality of being objective, freedom from bias.

Interclass correlation: 

• Measure a relation between two variables of different classes.
• The deviation of a variable is measured from the mean of the data for that class.
• Pearson’s correlation coefficient is the most commonly used measure of interclass correlation.
• Interclass correlation coefficients are recommended for the assessment of the reliability of the measurement scale.
• Inter-class correlation (ICC) is a statistical measure used to assess the reliability or consistency of measurements made by different observers or instruments.
• It is particularly useful for assessing the reliability of tests that involve subjective judgments, but it does not measure validity or accuracy.

Additional Information

• Partial correlation:
  • It measures the correlation of two variables while controlling the effects of another variable.
• Multiple correlations:
  • It is the correlation between two or more independent variables on a single dependent variable.
• One-way ANOVA:
  • It compares the means of two or more independent groups.

Confusion PointsOne-way ANOVA cannot be used to assess the reliability or objectivity of a test or measurement tool because it is designed to test for differences between groups, not for consistency within a group. ICC is a more appropriate measure for assessing reliability and objectivity.