Students in a statistics class are conducting a survey to estimate the mean number of units students at their college are enrolled in. the students collect a random sample of 49 students. the mean of the sample is 12.2 units. the standard deviation is 1.6 units. click here to open the applet. what is the 95% confidence interval for the number of units students in their college are enrolled in? assume that the distribution of individual student enrollment units at this college is approximately normal.