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[answered] A survey of 45 companies chosen randomly from the service i



A survey of 45 companies chosen randomly from the service industry was completed in the Greater Toronto Area. Purchasing managers were asked to provide the amount of office supplies purchased yearly (to the nearest dollar ? amounts exclude office furniture and computer equipment). The following table presents the data:

Yearly Expenditure - Office Supplies

3080

3400

4585

4336

4690

2840

4820

4582

1050

4095

6140

5220

5110

2250

3600

4875

2603

3940

2396

5252

3400

5824

3851

5100

4631

3565

2404

4695

1424

4875

4023

4953

5342

3534

4730

2942

2023

5918

3589

3436

4436

5140

6225

4195

3472


  • a. Would?you?accept?that?this?sample?is?drawn?from?a?population?that?has?an?average?office?supplies?purchased?yearly?for?all?services?firm?nationally?of?$?4,425??(2?points)
  • b.?What conditions and assumptions are required to answer the above question?
  • c. How would you modify your answer?in a if the standard deviation of the population was given as $1,025? (2 points)

 


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