Final answer:
The formula given represents a statistic for the Aspin-Welch T-test, used to compare two independent population means when population standard deviations are unknown and unequal, thus the correct answer is option (C) T-test.
Step-by-step explanation:
The formula t = (b2 - B2) / sb2 appears to represent a statistic that would be used in hypothesis testing when the population standard deviations are unknown and possibly unequal. This is characteristic of a T-test, specifically the Aspin-Welch t-test, which compares two independent population means. This t-test corrects for the degrees of freedom and is used when equal variances cannot be assumed. The choice that corresponds with the T-test among the given options is (C) T-test. The t-statistic is then compared against a critical value from a t-distribution table or calculated using a statistical software or calculator to determine the significance of the test.