The correlation coefficient between scores on two parts of a given test is 0.50. What is the reliability coefficient of the total test?

Correct option is B

The correlation coefficient between scores on two parts of a given test is 0.50. The reliability coefficient of the total test is 0.67. This can be calculated using the Spearman-Brown prophecy formula.
Information Booster:
1. The Spearman-Brown prophecy formula is used to predict the reliability of a test that is lengthened or shortened.
2. Reliability indicates the consistency and stability of test scores.
3. A higher reliability coefficient suggests greater consistency.
4. The split-half method is used to assess the internal consistency of a test.
Additional Information:
· Spearman-Brown Formula: Helps in understanding the impact of test length on reliability.
· Reliability Coefficient: Values range from 0 to 1, with higher values indicating better reliability.
· Split-Half Method: Divides the test into two halves to assess internal consistency.
· Internal Consistency: Measures how well the items on a test measure the same construct.