Which statements are true? Check all that apply.
The radius of the cone is 9 units
The height of the cone is 15 units
The height of the cone is 12 units
The volume of the cone is represented by the
expression 1.7(15) (9)
The volume of the cone is represented by the
expression 1. (9) (12)

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