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Joan s Nursery specializes in custom designed landscaping for residential areas The estimated labor cost...

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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 8 1 5 2 6 2 1 2 4 2 3 2 6 3 0 1 4 2 3 With a 0 05 level of significance test to see whether the mean tree planting time differs from two hours a State the null and alternative hypotheses Ho 2 Hai 2 O Ho 2 Ha 2 Ho 2 H 2 Ho 2 H H 2 Hoi H2 H 4 2 b Compute the sample mean c Compute the sample standard deviation Round your answer to three decimal places d What is the test statistic Round your answer to three decimal places What is the p value Round your answer to four decimal places p value e What is your conclusion diffors from two hours There is no reason to change from the two hours for cost estimating purposes

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