Males and Females Were Compared for the Mean Number of Smiles

Multiple Choice

Males and females were compared for the mean number of smiles during a five-minute inter-view. The 30 males' mean was 3.62 and the 24 females' mean was 5.04. An $\alpha$ level of .05 was adopted and an F = 4.02 was obtained. What conclusion is appropriate?

A) The null hypothesis should be retained.
B) Females smile more than males.
C) Males smile more than females.