__________is deciding what is to be decided

Which of the following errors will reduce the validity of a measure of the weight of a person without reducing the reliability of the measure?

A) The scale is not properly adjusted so that it always gives a reading that is six pounds too low. B) Participants are weighed wearing whatever clothes they happen to be wearing when they walk into the laboratory. C) Two different scales, each properly calibrated to give accurate readings, are used. D) All of the above

Which of the following would be a good example of collective goods?

a. national banks b. small businesses c. public transportation d. grocery stores