elementary statistics.doc - 1 Elementary Statistic...

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1Elementary Statistic*Question 6.A psychologist is interested in knowing whether adults who were bullied aschildren differ from the general population in terms of their empathy for others. On aquestionnaire designed to measure empathy, the mean score for the general population is 30.6.Random sampling of 67 scores obtained from individuals who were bullied yielded a mean of39.5 and a standard deviation of 6.6.(Use these numbers only for this question!)What are the degrees of freedom? (numeric value only)
*Question 7. A psychologist is interested in knowing whether adults who were bullied aschildren differ from the general population in terms of their empathy for others. On aquestionnaire designed to measure empathy, the mean score for the general population is 40.18.Random sampling of 141 scores obtained from individuals who were bullied yielded a mean of82.59 and a standard deviation of 5.01.(Use these numbers only for this question!)What is the z-value or t-value you obtained (your test statistic)? (numeric value only, includingnegative sign if required)
*Question 11.A psychologist is interested in knowing whether adults who were bullied aschildren differ from the general population in terms of their empathy for others. On aquestionnaire designed to measure empathy, the mean score for the general population is 72.1.
2Random sampling of 76 scores obtained from individuals who were bullied yielded a mean of118.08 and a standard deviation of 22.87.(Use these numbers only for this question!)Calculate the 99% confidence interval.
Question 12.A psychologist is interested in knowing whether adults who were bullied aschildren differ from the general population in terms of their empathy for others. On aquestionnaire 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 of39.5 and a standard deviation of 6.6.Calculate the99%confidence interval.
Steps:What is the new critical value you will use for this calculation?±1.645±2.064±2.756
3±2.7976.74
*Question 13.A psychologist is interested in knowing whether adults who were bullied aschildren differ from the general population in terms of their empathy for others. On aquestionnaire designed to measure empathy, the mean score for the general population is 66.88.

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