Lawn Service advertises that it will maintain an average cost per customer of $ 35 per hour. Assume that the costs are normally distributed. A random sample of 18 clients showed that the average cost is $ 32.50 per hour with a population standard deviation of $ 8.10. Does the data support the claim that the average hourly cost is less than $ 35.00? Use a significance level of 5%.

1. The alternate hypothesis is:

___Ha: = 35 ___Ha: > 35 ___Ha: <32.5 ___Ha: <35 2. The test statistic is is:

___-1.65 ___-1.31 ___-2.5 ___1.65 3. For a significance level of 5%, could the null hypothesis be rejected ?:

___No, because the test statistic is less than the z of the table ___No, because the test statistic is greater than the z of the table ___Yes, because the test statistic is greater than the z of the table ___Yes, because the test statistic is less than the z of the table