Vocabulary Select all the ways you can tell that there is no solution to a system of equations The equations have different slopes and have the same y-intercepts.

The equations have the same slope and have different y-intercepts.

The graph of the system shows the same line.

The graph of the system shows parallel lines.

The graph of the system shows perpendicular line

Agroup of student volunteers participates in a study designed to assess several behavioral interventions for improving output in a repetitive task. prior to the beginning of the study, all volunteers unknowingly observed, and their output is measured. at the beginning of the study, prior to any intervention, the volunteers perform the same task under the observation of a study administrator, and their overall output increases. which of the following terms describes this phenomenon? a. simpson's paradox b. hawthorne effect are d. novelty effect d. pygmalion effect e. observer-expectancy effect