1.5

(d) What is the test statistic? (Round your answer to three decimal places.) [:1 What is the pvalue? (Round your answer to four decimal places.) (e) What is your conclusion? 0 Reject HO. We cannot conclude that the mean treeplanting time differs from two hours. There is no reason to change from the two hours for cost estimating purposes. 0 Reject \"0' We can conclude that the mean treeplanting time differs from two hours. There is a reason to change from the two hours for cost estimating purposes. 0 Do not reject H0. We can conclude that the mean treeplanting time differs from two hours. There is a reason to change from the two hours for cost estimating purposes. O Do not reject H0. We cannot conclude that the mean tree-planting time differs from two hours. There is no reason to change from the two hours for cost estimating purposes. You may need to use the appropriate technology to answer this question. Joan's Nursery specializes in custom-desig ned 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 costestimating purposes, managers use two hours of labor time for the planting ofa medium-sized tree. Actual times from a sample of 10 plantings during the past month f0 low (times in hours). 1.8 1.4 2.7 2.1 2.4 2.3 2.6 3.0 1.4 2.3 With a 0.05 level of signicance, test to see whether the mean tree-planting time differs from two hours. (a) State the nu l and alternative hypotheses. H:u2 0 OHa:ySZ OH0:u=2 Haulzz H:u2 O 0 Ha:u>2 (b) Compute the sample mean. :l (c) Compute the sample standard deviation. (Round your answer to three decimal places.) :l