statistics questions!!
Data
| Company | Exchange | Ticker Symbol | Market Cap ($ millions) | Price/Earnings Ratio | Gross Profit Margin (%) |
| DeWolfe Companies | AMEX | DWL | 36.4 | 8.4 | 36.7 |
| North Coast Energy | OTC | NCEB | 52.5 | 6.2 | 59.3 |
| Hansen Natural Corp. | OTC | HANS | 41.1 | 14.6 | 44.8 |
| MarineMax, Inc. | NYSE | HZO | 111.5 | 7.2 | 23.8 |
| Nanometrics Incorporated | OTC | NANO | 228.6 | 38.0 | 53.3 |
| TeamStaff, Inc. | OTC | TSTF | 92.1 | 33.5 | 4.1 |
| Environmental Tectonics | AMEX | ETC | 51.1 | 35.8 | 35.9 |
| Measurement Specialties | AMEX | MSS | 101.8 | 26.8 | 37.6 |
| SEMCO Energy, Inc. | NYSE | SEN | 193.4 | 18.7 | 23.6 |
| Party City Corporation | OTC | PCTY | 97.2 | 15.9 | 36.4 |
| Embrex, Inc. | OTC | EMBX | 136.5 | 18.9 | 59.5 |
| Tech/Ops Sevcon, Inc. | AMEX | TO | 23.2 | 20.7 | 35.7 |
| ARCADIS NV | OTC | ARCAF | 173.4 | 8.8 | 9.6 |
| Qiao Xing Universal Tele. | OTC | 64.3 | 22.1 | 30.8 | |
| Energy West Incorporated | OTC | EWST | 29.1 | 9.7 | 16.3 |
| Barnwell Industries, Inc. | AMEX | BRN | 27.3 | 7.4 | 73.4 |
| Innodata Corporation | OTC | INOD | 66.1 | 11.0 | 29.6 |
| Medical Action Industries | OTC | MDCI | 137.1 | 26.9 | 30.6 |
| Instrumentarium Corp. | OTC | INMRY | 240.9 | 3.6 | 52.1 |
| Petroleum Development | OTC | PETD | 95.9 | 6.1 | 19.4 |
| Drexler Technology Corp. | OTC | DRXR | 233.6 | 45.6 | 53.6 |
| Gerber Childrenswear Inc. | NYSE | GCW | 126.9 | 7.9 | 25.8 |
| Gaiam, Inc. | OTC | GAIA | 295.5 | 68.2 | 60.7 |
| Artesian Resources Corp. | OTC | ARTNA | 62.8 | 20.5 | 45.5 |
| York Water Company | OTC | YORW | 92.2 | 22.9 | 74.2 |
Table 1.1 A Data Set for 25 Shadow Stocks