s worth 50 points. A research team took a sample of 7 observations from the random variable Y, which had a normal distribution N(u, 62). They observed y, = 243.9, where y, was the average of the 7 sampled observations and s = 85.6 was the observed value of the unbiased estimate of o2 based on the sample values. Find the symmetric 99% confidence interval for 2. A symmetric confidence interval is the usual one with equal right and left tail confidences. This part is worth 50 points