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 medium sized trees. Actual times from a sample of ten plantings during the past month are as follows: 1.7, 1.5, 2.6, 2.2, 2.4, 2.3, 2.6, 3.0, 1.4, 2.3. Assume that the population is normally distributed. Answer the following six questions
Based on this sample, what is the 95% confidence interval for the true mean tree planting time
Select one of the following: