Two Schedules for Giving Rest Were Compared-The Massed Schedule and the Spaced

Multiple Choice

Two schedules for giving rest were compared-the massed schedule and the spaced schedule. Twenty observations of the spaced schedule produced a mean of 26 errors. On the massed schedule 14 observations resulted in a mean of 36 errors. An $\alpha$ level of .05 was adopted and an F = 4.21 was obtained. What conclusion is appropriate?

A) The null hypothesis should be retained.
B) Massed practice produces fewer errors than spaced practice.
C) Spaced practice produces fewer errors than massed practice.