3 Suppose a statistics instructor believes that there is no signicant dijj'erence between the mean class scores of statistics day students on Exam 2 and statistics night students on Exam 2. She takes random samples from each of the populations. The mean and standard deviation for 35 statistics dag students were 75.86 and 16.91. The mean and standard deviation for i statistics night students were 75. 4 1 and 19.73. The \"day \" subscript refers to the statistics day students. The \"night \" subscript refers to the statistics night students. A concluding statement is: a. There is sufficient evidence to conclude that statistics night students' mean on Exam 2 is better than the statistics day students' mean on Exam 2. b. There is insufficient evidence to conclude that the statistics day students' mean on Exam 2 is better than the statistics night students ' mean on Exam 2. c. There is insufficient evidence to conclude that there is a significant difference between the means of the statistics dag) students and night students on Exam 2. d. There is suicient evidence to conclude that there is a significant direrence between the means of the statistics dag; students and night students on Exam 2. /