You are reading a research paper reporting on whether or not a new vaccine is more than 90% effective against a virus. The hypotheses are: Ho : p < 0.9; Ha : p > 0.9 The paper says that "the results were statistically significant". Remember that if the results are statistically significant, these means that H, was rejected. Otherwise, Ho was not rejected. Choose the statement that best characterizes the conclusion in simple terms: O The vaccine is at least 90% effective against the virus O The vaccine is less than 90% effective against the virus O The vaccine is not more than 90% effective against the virus O The vaccine is more than 90% effective against the virus