SPSS Homework Central Tendency _Aryannah Desty

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Dec 6, 2023

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PSYC 354 SPSS H OMEWORK : C ENTRAL T ENDENCY T EMPLATE Problem Set 1: A neuropsychologist assesses the cognitive functioning of 17 adults who are at- risk for Alzheimer’s disease using the Mini-Mental State Examination (MMSE). Scores higher than 24 indicate better cognitive functioning, while scores lower than 24 indicate worse functioning and possible early-stage Alzheimer’s disease. The scores are contained in the table below. Remember to put your initials within any and all variable names. MMSE Scores 26 29 29 8 29 24 10 28 28 27 29 28 27 26 30 29 26 1. Using the data in the table above, set up a data file in SPSS and create a table of descriptive statistics using the “Explore” command. Paste the table here: (8 pts) Descriptives Statistic Std. Error MMSEScoreA D Mean 25.4706 1.55090 95% Confidence Interval for Mean Lower Bound 22.1828 Upper Bound 28.7583 5% Trimmed Mean 26.1895 Median 28.0000 Variance 40.890 Std. Deviation 6.39451 Page 1 of 5
PSYC 354 Minimum 8.00 Maximum 30.00 Range 22.00 Interquartile Range 3.00 Skewness -2.349 .550 Kurtosis 4.610 1.063 Descriptive Statistics N Minimum Maximum Mean Std. Deviation MMSEScoreAD 17 8.00 30.00 25.4706 6.39451 Valid N (listwise) 17 2. Using the same data, create a histogram showing the distribution of MMSE scores in the sample. Paste the histogram here: (7 pts) Page 2 of 5
PSYC 354 3. List the mean and the median for MMSE scores. (4 pts) Mean: 25.4706 Median: 28.0000 4. Based on the information in numbers 1-3, which measure of central tendency would you use to describe this data set? Support your answer with material from the presentations and/or reading this week. (6 pts) Mode, median and mean are known as the main central tendency use in statistics but in the above data median seems to summarize the data set because it represents overall data. 5. Locate any outliers (scores that are more extreme than the rest of the data). Based on your knowledge of MMSE scores from the scenario, are there any patients you would recommend for further evaluation for Alzheimer’s? If so, how many? Explain your reasoning. (5 pts) Numbers 8 and 10 are considered outliers. I possibly consider recommending only one patient with the MMSE score 24 for further evaluation for Alzheimer’s . Problem Set 2: A forensic psychologist wants to examine the level of narcissistic personality traits in those who are diagnosed with antisocial personality disorder (ASPD) and those who do not qualify for ASPD within a local prison population. She administers a measure of narcissistic personality traits where higher scores indicate higher levels of narcissism and scores range from 0–35. Name your variables in Variable View. Assign values to the “Diagnosis” variable as follows: 1 = ASPD; 2 = no ASPD. Remember to put your initials within any and all variable names. Diagnosis Narcissism Score 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 34 2 28 30 29 4 35 34 34 32 12 8 12 12 6 5 Page 3 of 5
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PSYC 354 2 2 2 2 8 9 10 6 1. Using the data in the table above, set up your data file in SPSS and create one table of Descriptive Statistics using the “Explore” function that shows descriptives for narcissism split by group (ASPD and no ASPD separately). Paste the table here: (7 pts) Descriptives Statistic Std. Error Narcissism_AD Mean 17.5000 2.79803 95% Confidence Interval for Mean Lower Bound 11.6437 Upper Bound 23.3563 5% Trimmed Mean 17.3889 Median 12.0000 Variance 156.579 Std. Deviation 12.51315 Minimum 2.00 Maximum 35.00 Range 33.00 Interquartile Range 25.00 Skewness .361 .512 Kurtosis -1.794 .992 2. What is the standard deviation for the ASPD group in this sample? (5 pts) Standard deviation for the ASPD: 12.51315 3. Compare the means of each group (ASPD and no ASPD). What can you say about the narcissism scores of the ASPD group compared to the no ASPD group? (5 pts) The mean for ASPD is 26.2000 and the mean for no ASPD group is 8.8000. The overall average mean for both is 17.5000. Narcissism scores of the ASPD group is higher compared to the no ASPD group. 4. Using the same data, create a boxplot in SPSS to show the difference in narcissism scores between the two diagnostic groups. Paste the boxplot here: (7 pts) Page 4 of 5
PSYC 354 5. Locate the outliers for the ASPD group in the boxplot. (Outliers are depicted by dots that lie farther away from the rest of the data. The numbers next to the dots represent the row number in your data set where that score lies.) What effect do these data points have on the mean narcissism score for the ASPD group? (6 pts) The outliers for the ASPD group in the boxplot are number 2 and 6. The effect outliers’ data has on the mean narcissism score for the ASPD group lowers the mean because when the outliers were remove the mean went from 26.2000 to 28.8889. Page 5 of 5