Joan’s nursery specializes in custom design landscaping for residential areas. The estimated labor cost associated with a particular landscaping proposal is based on the number of planting of trees, shrubs, and so on to be used for the project. For cost estimating purposes, mangers believe that the actual average tree planting time exceeds two hours. The following is a list of tree planting times (in hours) for a sample of plantings during the past month:
1.7, 1.5, 2.6, 2.2, 2.4, 2.3, 2.6, 3.0, 1.4, 2.3.
a). Based on a 95% confidence level, estimate the actual average
b). Carefully interpret this interval estimation.
c). Using the results of the estimation, explain carefully whether or not there is sufficient evidence to support the managers’ belief.