Our environment is very sensitive to the amount of ozone in the upper atmosphere. The level of ozone normally found is 4.8 parts/ million (ppm). A researcher believes that the current ozone level is...

Our environment is very sensitive to the amount of ozone in the upper atmosphere. The level of ozone normally found is 4.8 parts/ million (ppm). A researcher believes that the current ozone level is not at a normal level. The mean of 9 samples is 4.3 PPM with a standard deviation of 0.6. Assume the population is normally distributed. A level of significance of 0.05 will be used. find the value of the test to statistic. round your answer to 3 decimal places.