Researchers in Norway examined the records of 85,176 children to look for a possible association between use of folic acid during pregnancy and development of autism. The null hypothesis of interest is that use of folic acid is not related to risk of autism. The researchers set a at 0.05 and stated that they had 93% power to detect a certain difference in autism rates. Explain what "93% power" means in this context. In particular, what is the probability of a Type II error?