Joan's Nursery specializes in custom-designed landscaping for residential areas. The estimated labor cost associated with a particular landscaping proposal is based on the number of plantings of trees, shrubs. and so on to be used for the project. For cost-estimating purposes, managers use two hours of labor time for the planting of a medium-sized tree. Actual times from a sample of 10 plantings during the past month ' follow (times in hours). 1.7, 1.5. 2.6, 2.2, 2.4. 2.3, 2.6, 3.0, 1.4, 2.3 What is the value of test statistics