Consider the following premises. Jennifer is running if and only if Susan is a scientist. If Susan were a scientist, then it is late. If it is late, then Susan is a scientist. It is not late. Can we infer the following from them? Jennifer is not running.
 From the fact that if Susan were a scientist, then it is late, and that if it is late, then Susan is a scientist we can infer that Susan is a scientist if and only if it is late. From the fact that Susan is a scientist if and only if it is late, and that it is not late we can infer that Susan is not a scientist. Finally, from the fact that Jennifer is running if and only if Susan is a scientist, and that Susan is not a scientist we can infer that Jennifer is not running. Therefore, the answer is yes.