A Research Project Studied the Physical Properties of Wood Materials

question 16

Multiple Choice

A research project studied the physical properties of wood materials constructed by bonding together small flakes of wood.The two factors considered were the size of the flakes and species of tree.The sizes of the flakes were S1: 0.15 inches by 2 inches and S2: 0.25 inches by 2 inches,and the species of tree used were aspen,birch,and maple.For each combination of flake size and tree species,three samples of wood material were constructed.For each sample,the physical property measured was the tension modulus of elasticity in the direction perpendicular to the alignment of the flakes,in pounds per square inch (psi) .The table below gives the means for the different size-species groups. What are the marginal means for species?

• A)387.33,292.67,and 323.33
• B)335.67,455.33,and 293.67
• C)723,748,and 617
• D)361.50,374.00,and 308.50

---

Definitions:

Indigenous Communities

Groups of people native to a region, possessing unique cultural traditions, languages, and connections to ancestral lands.

Natural Habitat

The original environment in which a plant or animal species lives and evolves.

Ecotourism

Responsible travel to natural areas that conserves the environment, sustains the well-being of the local people, and involves interpretation and education.

Cultural Trade

the exchange of goods, services, ideas, and cultural practices between different societies and cultures.