Final answer:
A correlation coefficient of +0.95 represents the best test-retest reliability, indicating a very strong positive correlation and high reliability when a test is administered multiple times.
Step-by-step explanation:
The correlation coefficient is a statistical measure that reflects the correlation or association between two variables. Test-retest reliability refers to the consistency of a test's results when administered multiple times under the same conditions. Correlation coefficients range from -1 to +1, with +1 indicating a perfect positive correlation, -1 indicating a perfect negative correlation, and 0 indicating no correlation at all.
In the context of test-retest reliability, a high positive correlation coefficient is desirable as it suggests that the test is reliable and produces consistent scores upon repeated administrations. Therefore, the answer related to the strongest reliability would be the highest positive value provided. Comparing the options given, +0.95 represents the best test-retest reliability because it is the closest to +1, demonstrating a very strong positive correlation and indicating high reliability.