A researcher has conducted a study on the mean IQ score of a group of gifted school children. Her null and alternative hypotheses are: Ho : / = 100 US Ha : ( > 100 85 100 115 130 Which of the following results produces Type I error? O A: The mean IQ is 120 and the null is retained. O B: The mean IQ is 100 and the null is rejected. O C: The mean IQ is 100 and the null is retained. O D: The mean IQ is 120 and the null is rejected