1. A child psychologist was interested in the difference in age (in years) between a boy and a girl

1.      A child psychologist was interested in the difference in age (in years) between a boy and a girl when they first learn to ride a two-wheeled bicycle. The psychologist calculated a 99% confidence interval for the difference in age to be (-0.58, 0.71). Can he conclude that there is no difference in age, on the average, at which boys and girls learn to ride a two-wheeled bicycle