1. An environmental group collects a liter of water from each of 45 ran- dom locations along a stream and measures the amount of dissolved oxygen in each specimen. The mean is 4.62 milligrams (mg). Is this strong evidence that the stream has a mean oxygen content of less than 5 mg per liter? To do this, suppose you know that the dissolved oxygen varies among locations according to a normal distribution and the standard deviation is 0' = 0.92 mg. Let H0 be the hypothesis that the mean of the entire stream is indeed 5 mg. We want to compute the probability that a sample will have a mean of 4.62 mg or lower. Find the p-value of this experiment. Is this result signicant at the a = .05 level? Discuss your results. [2, 14.17]