Our environment is very sensitive to the amount of ozone in theupper atmosphere. The level of ozone normally found is 6.4parts/million (ppm). A researcher believes that the current ozonelevel is at an excess level. The mean of 27 samples is 6.8 ppm witha standard deviation of 1.1. Does the data support the claim at the0.05 level? Assume the population distribution is approximatelynormal.

Step 1 of 5 : State the null and alternative hypotheses.

Step 2: right or left tailed

step 3: t critical value

Step 4: decision rule reject Ho if t >

Step 5 : reject or fail to reject