State the null an alternative hypothesesFind the value of test statistic?Specify if the test is one-tailed or two -tailed?Determine The decision rule for rejecting the null hypotheses: H0 if t >__________Make the decision to reject or fail the null hypothesis?

Our environment is very sensitive to the amount of ozone in the upper atmosphere. The level of ozone normally found is 5.3 parts/million (ppm). A researcher believes that the current ozone level is at an excess level. The mean of 15 samples is 5.4 ppm with a standard deviation of 0.9. Does the data support the claim at the 0.05 level? Assume the population distribution is approximately normal