Question

Our environment is very sensitive to the amount of ozone in the upper atmosphere. The level of ozone normally found is 7.0 parts/million (ppm). A researcher believes that the current ozone level is at an insufficient level. The mean of 6 samples is 6.8 ppm with a standard deviation of 0.7. Does the data support the claim at the 0.05 level? Assume the population distribution is approximately normal.

State the null and alternative hypotheses. ( i think Ho: u=7, Ha: u<7)

Find the value of the test statistic. Round your answer to three decimal places.

Specify if the test is one-tailed or two-tailed. ( i think 1 tailed)

Determine the decision rule for rejecting the null hypothesis. Round your answer to three decimal places.

Make the decision to reject or fail to reject the null hypothesis.

Answer 1