Our environment is very sensitive to the amount of ozone in the upper atmosphere. The level of ozone normally found is 5.2 parts/million (ppm). A researcher believes that the current ozone level is not at the normal level. The mean of 9 samples is 4.7 ppm with a standard deviation of 1.1. Does the data support the claim at the 0.1 level? Assume the population distribution is approximately normal. Specify if the test is one-tailed or two-tailed.