Question

4. 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 in hours are as follows: 1.7 1.5 2.6 2.2 2.4 2.3 2.63.042.3 With a 0.05 level of significance, test to see whether the mean tree-planting time differs from two hours. (Show all the five steps.) (Hint: you will need to calculate sample mean and sample standard deviation first) eTS 5 Points)

Answer 1

i.e. mean painting time is not differ singificant from 2 hours.

panting time ree 2 out 2.89 2.2S I 0 2.2 2-4576 2.3 529 2. 3- 0 = 2.2 6. 76 、Standard deviation 1.96 5.29 SO Tatol 22 50.8 test statistic ' 天一μ。 2.2-2 1.2242 table valuc 0.25) 02s)2.22 e mean tree