Chapter 13 - Nonparametric Statistics - 13-2 Sign Test - Basic Skills and Concepts - Page 646: 3

$H_a$ is not contradicted.

$H_0$: there is no difference between the population of September weights and April weights. $H_a$: there is difference between the population of September weights and April weights. The sample contradicts $H_a$ if the number of positive signs and number of negative signs is equal. Here $H_a$ is not contradicted.