Our environment is very sensitive to the amount of ozone in the upper atmosphere. The level of ozone normally found is5.4 parts/million (ppm). A researcher believes that the current ozone level is not at a normal level. The mean of9 samples is5.0 ppm with a variance of0.64. Assume the population is normally distributed. A level of significance of0.02will be used. Find the value of the test statistic. Round your answer to three decimal places.