. A random sample of 20 students yielded a mean of = 72 and a variance of s2 = 16 for scores on a college placement test in mathematics. Assuming the scores to be normally distributed, construct a 98%...

. A random sample of 20 students yielded a mean of = 72 and a variance of s2 = 16 for scores on a college placement test in mathematics. Assuming the scores to be normally distributed, construct a 98% confidence interval for o2. attach a photo also or solution how you came up in your chie-square