A woman in a business dress stands behind a podium and she is slouching and holding the attached microphone with one hand. Sandra's slouching posture signal to the audience : c. she is unsure of herself.
A speaker is perceived as having inadequate subject expertise and lacking confidence if they are slouching. You can convey confidence and conviction to the audience by having a proper posture. Because you'd be more confident, the audience would be more likely to pay attention to what you had to say.
There is a two-way communication between the speaker and the audience, and the speaker attempts to help the audience make the best decision for themselves.
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