Childhood maltreatment is thought to be linked to adult narcissistic traits. In particular, it is thought that the more severe the childhood maltreatment, the more a person would suffer from the vulnerable form of narcissism. Individuals with this type of personality disorder display attention-seeking behaviors, lack empathy, are resentful, have an inferiority complex, and view criticism as a personal attack. As a result, these individuals can be very resentful and vindictive towards others. A research clinician has a sample of n=20 patients who have suffered extreme childhood maltreatment and agree to be assessed on a well-known interval scale for vulnerable narcissism. For the general population, scores on the vulnerable narcissism scale are normally distributed with a μ = 25 and s=4. The sample of patients score an average of M=29. Can the research clinician conclude that the sample of patients who have experienced childhood maltreatment score significantly higher in vulnerable narcissism that the general population? (test at alpha = .05 and show all of the steps of hypothesis testing) (use z-score not a one-sample t-test)

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Childhood maltreatment is thought to be linked to adult narcissistic traits. In particular, it is thought that the more severe the childhood maltreatment, the more a person would suffer from the vulnerable form of narcissism. Individuals with this type of personality disorder display attention-seeking behaviors, lack empathy, are resentful, have an inferiority complex, and view
criticism as a personal attack. As a result, these individuals can be very resentful and vindictive towards others. A research clinician has a sample of n=20 patients who have suffered extreme childhood maltreatment and agree to be assessed on a well-known interval scale for vulnerable narcissism. For the general population, scores on the vulnerable narcissism scale are normally distributed with a μ = 25 and s=4. The sample of patients score an average of M=29.

Can the research clinician conclude that the sample of patients who have experienced childhood maltreatment score significantly higher in vulnerable narcissism that the general population? (test at alpha = .05 and show all of the steps of hypothesis testing) (use z-score not a one-sample t-test) 

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