1. A psychologist is interested in knowing whether adults who were bullied as children differ from the
general population in terms of their empathy for others. On a questionnaire designed to measure
empathy, the mean score for the general population is 30.6. Random sampling of 25 scores obtained
from individuals who were bullied yielded a mean of 39.5 and a standard deviation of 6.6.

2. A psychologist is interested in knowing whether adults who were bullied as children differ from the
general population in terms of their empathy for others. On a questionnaire designed to measure
empathy, the mean score for the general population is 54.76. Random sampling of 90 scores obtained
from individuals who were bullied yielded a mean of 41.9 and a standard deviation of 20.26.
What is the z-value or t-value?
3. A psychologist is interested in knowing whether adults who were bullied as children differ from the
general population in terms of their empathy for others. On a questionnaire designed to measure
empathy, the mean score for the general population is 93.39. Random sampling of 76 scores obtained
from individuals who were bullied yielded a mean of 97.5 and a standard deviation of 22.87.
Calculate the 99% confidence interval.