Which of the following is the correct null hypothesis for this research?
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Researchers know that when placed in a high-stress environment, the general population has an average heart rate of 97 beats per minute () with a standard deviation of 8.4 beats per minute, (). Individuals with anti-social personality disorder (psychopaths) tend to have lower heart rates than the general population (i.e., muted stress response). A clinical neuropsychologist finds that a sample of N = 6 patients suspected of having anti-social personality disorder have an average heart rate of 83 beats per minute ( ) in a high-stress environment. The researchers was to know if the average heart rate of the sample of patients significantly lower than the general population.
Which of the following is the correct null hypothesis for this research?
The difference in heart rate between psychopaths and the general population is nonsignificant.
There is a statistically significant difference in heart rate between psychopaths and the general population.
The difference in heart rate between psychopaths and the general population is clinically significant.
There is no statistically significant difference in heart rate between psychopaths and the general population.
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