Null Hypothesis – company needs not less than 745 transformers

2006

2007

2008

Mean

801.167

898.667

990.333

Standard Error

24.188

39.529

41.950

Median

793.000

864.000

941.000

Mode

708.000

#N/A

#N/A

Standard Deviation

83.789

136.931

145.320

Sample Variance

7020.515

18750.061

21117.879

Kurtosis

-1.627

-0.609

-0.853

Skewness

0.122

0.772

0.650

Range

221.000

394.000

448.000

Minimum

695.000

739.000

798.000

Maximum

916.000

1133.000

1246.000

Sum

9614.000

10784.000

11884.000

Count

12.000

12.000

12.000