gnment nt: Chapter 9 Assignment Assignment Score: Save Submit Assignment for Gra Exercise 09.34 Algo (Population Mean: Sigma Unknown) Question 4 Hint(s) Check My W Joan's Nursery specializes in custom-designed landscaping for residential areas. The estimated labor cost associa with a particular landscaping proposal is based on the number of plantings of trees, shrubs, and so on to be used the project. For cost estimating purposes, managers use two hours of labor time for the planting of a medium-siz tree. Actual times from a sample of 10 plantings during the past month follow (times in hours). 2.2 1.4 2.8 2.5 2.7 1.5 2.4 3.1 2.4 1.7 With a 0.05 level of significance, test to see whether the mean tree-planting time differs from two hours. a. State the null and alternative hypotheses. Ho : u = Ha : M # b. Compute the sample mean. * (to 2 decimals) c. Compute the sample standard deviation. (to 4 decimals) d. Find the test statistic and p-value. (Use Table 2 in Appendix B.) * (to 3 decimals) t p-value between 0.10 and 0.20