Students in a statistics class conduct a survey to estimate the mean number of units students at their college are enrolled in. the students took a random sample of 50 students from their college. the students calculated a 90% confidence interval to estimate the mean number of units students at their college are enrolled in. the confidence interval was too wide to provide a precise estimate. the students are strategizing about how to produce a narrower confidence interval. true or false? the students could produce a narrower confidence interval by increasing the sample size to 100.