Establishing the properties of materials is an important

problem in identifying a suitable substitute for biodegradable

materials in the fast-food packaging industry. Consider the

following data on product density (g/cm3) and thermal conductivity K-factor (W/mK) published in Materials Research

and Innovation (1999, pp. 2-8).

Thermal Conductivity, y Product Density, x

0.0480 0.1750

0.0525 0.2200

0.0540 0.2250

0.0535 0.2260

0.0570 0.2500

0.0610 0.2765

(a) Create a scatter diagram of the data. What do you

anticipate will be the sign of the sample correlation

coefficient?

(b) Compute and interpret the sample correlation coefficient.