Final answer:
The experimental design needed for a one-sample t-test is B. Repeated measures design.
Step-by-step explanation:
To perform a one-sample t-test, the type of experimental design needed is most accurately described as a test of a single mean. This implies that we are comparing the mean from a single sample to a known value or a theoretical mean.
A one-sample t-test is used to compare the mean of a sample to a known value or population mean. In this type of test, the same group of participants is measured twice, once before and once after an intervention or treatment. This design is known as a repeated measures design, where each participant serves as their control. Options A, C, and D refer to different types of experimental designs, but they are not specifically tailored for a one-sample t-test.
So, the answer is B.