A clinical psychologist is interested in testing whether serial killers are more introverted than the general population. A sample of 9 serial killers serving life sentences was tested and found to have a sample mean introversion score of 41 and standard deviation (s) of 6.8. If the population mean (µ) is 36, are serial killers significantly different from the normal population?  a. What are the null and alternative hypotheses? b. Report and interpret an effect size.

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Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.