?“Power Posing: Brief Nonverbal Displays Affect Neuroendocrine Levels and Risk T

Question

?“Power Posing: Brief Nonverbal Displays Affect Neuroendocrine Levels and Risk Tolerance” was published in Psychological Science, September 2010, and describes an experiment involving 42 participants (male and female), where 20 participants were randomly assigned to hold low-power poses (contractive positions, closed limbs) and 22 to hold high-power poses (expansive positions, open limbs) for two minutes. All participants were told that the aim of this exercise was to see if their heart rate changed. After the exercise, each participant was given $2 and told that they could keep the money or roll a die for a double or nothing. The resulting data are shown below.

Research question: Are people who hold “high-power poses” more likely to take risks (such as the double or nothing bet) compared to those who hold “low-power poses”?

d. Null: Probability of selecting the high-risk option is the different, based on whether the person holds a high-power pose or a low-power pose.
Alt: Probability of selecting the high-risk option is lower for a person who holds a high-power pose than for a person who holds a low-power pose.

3. State the null and alternative hypotheses in symbols.

a. Null: Probability of selecting the high-risk option is lower for a person who holds a high-power pose than for a person who holds a low-power pose.
Alt: Probability of selecting the high-risk option is the different, based on whether the person holds a high-power pose or a low-power pose. Low-power pose High-power pose Total 21 21 42 18 Took the doubleYes or nothing" bet?No Total 3 17 20 4

Explanation / Answer

1] Null and Alternative hypothesis in words

option b] Null Hypothesis : Probability of selecting the high-risk option is the same, regardless of whether the person holds a high-power pose or a low-power pose.
Alternative Hypothesis : Probability of selecting the high-risk option is higher for a person who holds a high-power pose than for a person who holds a low-power pose.

3] Null and Alternative hypothesis in symbol,

Option d] H0: high = low
Ha: high > low

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