Table 3
Mean, rank, t-test and significance of the respondents on GB construction needs.
| S/n | Items | Total sample | Group 1 | Group 2 | t-cal | Sig. | |||
|---|---|---|---|---|---|---|---|---|---|
|
|
|
|
|||||||
| Mean | Rank | Mean | Rank | Mean | Rank | ||||
| 36 | Reducing building site pollution | 4.43 | 2 | 4.33 | 3 | 4.48 | 1 | −1.13 | 0.26 |
| 37 | Shedding top-soil and avoiding top soil run-off | 4.18 | 8 | 4.00 | 9a | 4.27 | 6a | −1.87 | 0.06 |
| 38 | Minimizing impact of light pollution | 4.28 | 5 | 3.93 | 12 | 4.46 | 2a | −3.91 | 0.00 |
| 39 | Avoiding site disturbances to minimize degradation | 4.12 | 11 | 3.83 | 14 | 4.27 | 6a | −2.93 | 0.00 |
| 40 | Site erosion control | 4.30 | 3a | 4.15 | 6 | 4.37 | 4 | −1.37 | 0.17 |
| 41 | Sedimentation control | 3.99 | 15 | 3.78 | 15 | 4.09 | 14 | −1.80 | 0.07 |
| 42 | On-site manufacturing techniques | 4.10 | 12 | 4.09 | 8 | 4.11 | 13 | −0.15 | 0.88 |
| 43 | Improving material handling | 4.19 | 7 | 4.15 | 6 | 4.20 | 8a | −0.31 | 0.76 |
| 44 | Effective procurement as at when needed | 4.23 | 6 | 4.35 | 2 | 4.17 | 11 | 1.22 | 0.22 |
| 45 | Efficient storage as pertains to materials and products | 4.30 | 3a | 4.28 | 4 | 4.30 | 5 | −0.14 | 0.89 |
| 46 | Accurate installations of materials and products | 4.46 | 1 | 4.46 | 1 | 4.46 | 2a | −0.04 | 0.97 |
| 47 | Managing Indoor Air Quality (IAQ) | 4.13 | 10 | 4.00 | 9a | 4.20 | 8a | −1.31 | 0.19 |
| 48 | Reusing onsite generated topsoil in landscaping | 3.85 | 17 | 3.72 | 16 | 3.92 | 17 | −1.07 | 0.29 |
| 49 | Metering site electrical and water usage | 4.04 | 13a | 3.98 | 11 | 4.07 | 15 | −0.52 | 0.60 |
| 50 | Communicating site goals with sanctions for defaulters | 4.04 | 13a | 3.87 | 13 | 4.12 | 12 | −1.67 | 0.10 |
| 51 | Sourcing reclaimed materials for site equipment | 3.87 | 16 | 3.63 | 17 | 4.00 | 16 | −1.92 | 0.06 |
| 52 | Conducting safety meetings for goal assessment and alignment | 4.17 | 9 | 4.15 | 6 | 4.18 | 10 | −0.17 | 0.87 |
| Cluster value | 4.16 | 4.04 | 4.22 | −2.29 | 0.02 | ||||
Note: Group 1 refers to lecturers, instructors, teachers and technologists teaching building construction and related trades in tertiary and secondary institutions. Group 2 refers to building industry workers such as engineers, architects, technicians, plumbers, etc with minimum of Senior Secondary certificate in building related trades. a = Equal ranks wherein the next rank is skipped; t-cal = Calculated t-value; Sig. = Level of significance at 0.05.
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