Joan's Nursery specializes in custom-designed landscaping for residential areas. The estimated labor cost associated with a...

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 one and a half 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). With a 0.05 level of significance, test to see whether the mean tree-planting time differs from one and half hours.

3.2 0.9. 2.3 2.2 1.6 2.5 2.3 1.4 2.0 1.7

a. State the null and alternative hypotheses.

b. Compute the sample mean. (to 1 decimal)

c. Compute the sample standard deviation. (to 3 decimals)

d. What is the p-value?

-value (to 3 decimals) -value e. What is your conclusion? We reject the null. There enough evidence to prove that the mean tree-planting time differs from hours.

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orchestra answered 2 years ago

Joan's Nursery specializes in custom-designed landscaping for residential areas. The estimated labor cost associated with a...

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 one and half 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). 1.5 0.9 2.6 1.6 2.4 3.3...

Joan's Nursery specializes in custom-designed landscaping for residential areas. The estimated labor cost associated with a...

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 1.4 2.7 2.1 2.4 2.3 2.6 3.0 1.4...

For cost purposes, Holly’s Nursery managers use two and one half hours of labor time for...

For cost purposes, Holly’s Nursery managers use two and one half hours of labor time for planting a medium – sized tree. Actual times from a sample of 12 plantings during the past month follow (times in hours). The data below can be imported into Excel for analysis. 1.8 1.2 2.1 2.7 2.7 3 0.6 1.8 2.6 1.3 1.5 0.9 With a 0.05 level of significance, test to see whether the mean tree planting time differs from 2.5 hours. a....

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Joan's Nursery specializes in custom-designed landscaping for residential areas. The estimated labor cost associated with a...

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