1)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 2 hours of labor time for the planting of a medium-size tree.Actual times from a sample of 50 plantings during the past month follow (times in hours).

2.8

3.1

1.9

1.4

3.2

1.8

0.5

0.8

0.8

3.1

2.1

0.8

2.2

0.6

2.1

2.2

2.4

3.2

2.6

0.7

3.4

2.6

0.7

0.7

3.5

2.2

3.4

2.7

1.0

3.5

2.2

1.2

2.4

1.7

3.0

0.7

1.7

0.6

0.6

2.1

1.6

0.5

3.0

2.8

1.7

1.0

1.7

1.1

2.8

1.2

Using a .05 level of significance, test to see whether the mean tree-planting time is statistically lessthan 2 hours (Cut and paste the numbers to Excel).

a.State the null and alternative hypotheses.

b.What is the critical value for the test?

c.Compute the sample mean.

d.Compute the sample standard deviation.

e.Compute the value of the test statistic.

f.What is your conclusion (use the critical value approach for this part)?

g.What can you say about thep-value?