Calculate the value of the mean absolute percentage error

Placing a sample bar of soap in every mail box within a 10-block area is an example of:

A) direct sampling B) cross-ruff sampling C) selective sampling D) response sampling

Two assets have a coefficient of correlation of -.4

A) Combining these assets will increase risk. B) Combining these assets will have no effect on risk. C) Combining these assets may either raise or lower risk. D) Combining these assets will reduce risk.