A researcher measures mood for a group of participants who listened to happy music for 20 minutes, and a second group who listened to sad music for 20 minutes. If different mood scores are obtained for the two groups, the researcher would like to conclude that music influences mood. However, the happy music group was tested in a room painted yellow and the sad music group was tested in a room painted dark brown. The researcher is concerned the room color may have accidentally influenced mood. What kind of validity is being questioned

Which of the following is a problem in the health care system of the united states? a. too many doctors in rural areas b. too many doctors who are general practitioners c. fraud d. costs that are too low

Read the paragraph and answer the question that follows: the town of belmond, iowa, needs to add weather sirens. the loud and steady wail would warn citizens of approaching danger. if past history is an indication, the sirens will save hundreds of lives. with a prediction of a deadly storm season, the alert which sentence should be revised to eliminate redundancy? the town of belmond, iowa, needs to add weather sirens. the loud and steady wail would warn citizens of approaching danger. if past history is an indication, the sirens will save hundreds of lives. with a prediction of a deadly storm season, the alert system is needed immediately.

Arecent challenge to the european union created by a member state is?