A random sample of 65 pumpkins is obtained and the mean circumference is found to be 40.7 cm. Assuming that the population standard deviation is known to be 1.8 cm, use a 0.05 significance level to test the claim that the mean circumference of all pumpkins is greater than 40 cm.

1. State the hypotheses.

2. Find the critical value(s).

3. Compute the test statistic.

4. Make the decision.

5. Summarize the results.