STUDENTSTATSLAB • PSYCHOLOGY • SPSS • RESEARCH METHODS
SPSS FOR PSYCHOLOGY STUDENTS
Research Methods & Statistics Guide
Choose the right statistical test • Analyze data in SPSS • Interpret output • Report results clearly
A practical, psychology-focused guide for research projects, dissertations and theses.
Includes 30 pages of decision guides, SPSS routes, APA-style reporting patterns, psychology-
specific examples, worked mini-cases, Likert-scale guidance, assumption checks, common
mistakes and final checklists.
StudentStatsLab
SPSS for Psychology Students - Research Methods & Statistics Guide
, STUDENTSTATSLAB • PSYCHOLOGY • SPSS • RESEARCH METHODS
Contents
1. How to Use This Guide
MORE PRACTICEExample: If your dissertation asks whether social-media use is related to self-esteem, first
identify how both variables are measured. Two quantitative scores suggest a correlation question; converting
social-media use into groups changes the analysis.
2. From Research Question to Test
3. Variable Types & Measurement Levels
MORE PRACTICEExtra example: therapy condition and diagnosis category are categorical; reaction time is
continuous; a single 1-5 satisfaction response is ordinal. Measurement level directly affects which analyses are
defensible.
4. Descriptive Statistics in SPSS
MORE PRACTICEWorked interpretation: Mindfulness M = 18.4, Control M = 22.7, so the raw observed difference is
4.3 points. Descriptives establish direction and size before the inferential test is considered.
5. Assumptions & Diagnostics
MORE PRACTICEExample: if reaction times are mostly 300-900 ms but one value is 8,500 ms, verify whether it is
genuine, a unit error or a data-entry error before deciding how to handle it.
6. Independent-Samples t-Test
MORE PRACTICESecond example: compare memory scores for a sleep-deprived group and a normal-sleep group.
Different participants are in each condition, so the groups are independent.
7. Paired-Samples t-Test
MORE PRACTICESecond example: the same participants complete a mood scale before and after a relaxation
exercise. The analysis focuses on each participant's change, not two unrelated group means.
8. One-Way ANOVA
MORE PRACTICESecond example: compare attention scores across low, medium and high caffeine groups. A
significant omnibus ANOVA means at least one group differs; follow-up comparisons identify where.
9. Chi-Square Test of Independence
MORE PRACTICESecond example: attachment style (secure/insecure) and counselling use (yes/no) are both
categorical. A contingency table shows the pattern; chi-square tests whether the variables are associated.
10. Pearson & Spearman Correlation
MORE PRACTICEExtra interpretation: higher loneliness with higher depression is a positive association; higher
social support with lower stress is a negative association. Always discuss the coefficient, not only p.
11. Linear Regression
MORE PRACTICEExpanded example: in a model predicting anxiety from stress, sleep and social support, each
coefficient describes its association with anxiety while the other included predictors are held constant.
12. Non-Parametric Alternatives
MORE PRACTICEPsychology example: two therapy groups rate helpfulness on a single 1-5 ordinal item. A rank-
based Mann-Whitney comparison may fit the measurement scale better than a mean-based t-test.
13. Likert-Scale Data
MORE PRACTICEScoring example: on a 1-5 scale, a reverse-keyed item is recoded 1 ↔5, 2↔4 and 3 stays 3 before
computing the composite score.
14. Reading SPSS Output
SPSS for Psychology Students - Research Methods & Statistics Guide
, STUDENTSTATSLAB • PSYCHOLOGY • SPSS • RESEARCH METHODS
15. APA-Style Reporting
MORE PRACTICEReporting tip: do not write only “Sig. = .003”. Translate it into the finding: which group scored
higher/lower or which variables were positively/negatively associated.
16. Worked Example: Mindfulness vs Control
MORE PRACTICEExtension: if anxiety were measured both before and after treatment and the question
concerned change over time by group, a more complex repeated/mixed analysis could be required.
17. Worked Example: Pre/Post Anxiety
MORE PRACTICEParticipant illustration: A 24→18, B 20→17, C 19→20. The paired analysis preserves these within-
person links and evaluates the average difference.
18. Worked Example: Three Therapy Conditions
MORE PRACTICEFollow-up example: if CBT and mindfulness each differ from wait-list but not from one another,
the correct conclusion is not that all three groups differ.
19. Worked Example: Stress & Sleep
MORE PRACTICEScatterplot example: a cloud rising from lower-left to upper-right suggests a positive association.
A U-shaped cloud would not be well summarized by a simple linear correlation.
20. Worked Example: Categorical Association
MORE PRACTICEPercentage view: online completion = 42/60 = 70%; face-to-face completion = 52/60 ≈ 87%.
Percentages make the direction of the association easier to understand.
21. Worked Example: Multiple Regression
MORE PRACTICECoefficient example: if B = 0.54 for stress, a one-unit increase in stress is associated with an
estimated 0.54-point increase in anxiety, holding the other predictors constant.
22. Choosing Between Similar Tests
MORE PRACTICEFast check: ask (1) what type of outcome do I have, and (2) are observations independent or
related? These two questions eliminate many inappropriate tests.
23. Common Psychology Research Mistakes
MORE PRACTICEExample: deleting legitimate high scores only because p changes from .08 to .04 is not a
defensible exclusion rule. Data-cleaning decisions should be justified independently of the desired result.
24. SPSS Menu Map
MORE PRACTICEWorkflow tip: before clicking OK, check Statistics, Options, Plots or Cells so the output contains
the diagnostics and summaries you actually need for interpretation.
25. Statistical Test Decision Tree
MORE PRACTICEExample route: “Does stress differ across first-, second- and third-year students?” Continuous
stress outcome + three independent year groups → one-way ANOVA as a starting point.
26. Reporting Templates
MORE PRACTICEExample transformation: SPSS gives M1 = 18.4, M2 = 22.7, t = -3.05, df = 58, p = .003. Your report
should turn those numbers into a sentence explaining the group difference.
27. Mini Practice Questions
MORE PRACTICEExtra practice: A single 1-5 satisfaction item is compared between two independent groups.
What measurement issue should you consider before choosing the test?
28. Answer Key
MORE PRACTICEExtra answer: a single Likert item is ordinal; consider whether a rank-based independent-group
comparison is more appropriate than treating the item as continuous.
SPSS for Psychology Students - Research Methods & Statistics Guide
, STUDENTSTATSLAB • PSYCHOLOGY • SPSS • RESEARCH METHODS
29. Final Research Checklist
MORE PRACTICEBefore submission: verify every reported mean, SD, statistic, degree of freedom and p-value
against the final SPSS output, and keep a record of recoding and exclusions.
30. Final Quick Reference
MORE PRACTICEFinal example: social support + anxiety as two quantitative scores suggests correlation;
predicting anxiety from support while adjusting for stress and age suggests regression.
SPSS for Psychology Students - Research Methods & Statistics Guide
SPSS FOR PSYCHOLOGY STUDENTS
Research Methods & Statistics Guide
Choose the right statistical test • Analyze data in SPSS • Interpret output • Report results clearly
A practical, psychology-focused guide for research projects, dissertations and theses.
Includes 30 pages of decision guides, SPSS routes, APA-style reporting patterns, psychology-
specific examples, worked mini-cases, Likert-scale guidance, assumption checks, common
mistakes and final checklists.
StudentStatsLab
SPSS for Psychology Students - Research Methods & Statistics Guide
, STUDENTSTATSLAB • PSYCHOLOGY • SPSS • RESEARCH METHODS
Contents
1. How to Use This Guide
MORE PRACTICEExample: If your dissertation asks whether social-media use is related to self-esteem, first
identify how both variables are measured. Two quantitative scores suggest a correlation question; converting
social-media use into groups changes the analysis.
2. From Research Question to Test
3. Variable Types & Measurement Levels
MORE PRACTICEExtra example: therapy condition and diagnosis category are categorical; reaction time is
continuous; a single 1-5 satisfaction response is ordinal. Measurement level directly affects which analyses are
defensible.
4. Descriptive Statistics in SPSS
MORE PRACTICEWorked interpretation: Mindfulness M = 18.4, Control M = 22.7, so the raw observed difference is
4.3 points. Descriptives establish direction and size before the inferential test is considered.
5. Assumptions & Diagnostics
MORE PRACTICEExample: if reaction times are mostly 300-900 ms but one value is 8,500 ms, verify whether it is
genuine, a unit error or a data-entry error before deciding how to handle it.
6. Independent-Samples t-Test
MORE PRACTICESecond example: compare memory scores for a sleep-deprived group and a normal-sleep group.
Different participants are in each condition, so the groups are independent.
7. Paired-Samples t-Test
MORE PRACTICESecond example: the same participants complete a mood scale before and after a relaxation
exercise. The analysis focuses on each participant's change, not two unrelated group means.
8. One-Way ANOVA
MORE PRACTICESecond example: compare attention scores across low, medium and high caffeine groups. A
significant omnibus ANOVA means at least one group differs; follow-up comparisons identify where.
9. Chi-Square Test of Independence
MORE PRACTICESecond example: attachment style (secure/insecure) and counselling use (yes/no) are both
categorical. A contingency table shows the pattern; chi-square tests whether the variables are associated.
10. Pearson & Spearman Correlation
MORE PRACTICEExtra interpretation: higher loneliness with higher depression is a positive association; higher
social support with lower stress is a negative association. Always discuss the coefficient, not only p.
11. Linear Regression
MORE PRACTICEExpanded example: in a model predicting anxiety from stress, sleep and social support, each
coefficient describes its association with anxiety while the other included predictors are held constant.
12. Non-Parametric Alternatives
MORE PRACTICEPsychology example: two therapy groups rate helpfulness on a single 1-5 ordinal item. A rank-
based Mann-Whitney comparison may fit the measurement scale better than a mean-based t-test.
13. Likert-Scale Data
MORE PRACTICEScoring example: on a 1-5 scale, a reverse-keyed item is recoded 1 ↔5, 2↔4 and 3 stays 3 before
computing the composite score.
14. Reading SPSS Output
SPSS for Psychology Students - Research Methods & Statistics Guide
, STUDENTSTATSLAB • PSYCHOLOGY • SPSS • RESEARCH METHODS
15. APA-Style Reporting
MORE PRACTICEReporting tip: do not write only “Sig. = .003”. Translate it into the finding: which group scored
higher/lower or which variables were positively/negatively associated.
16. Worked Example: Mindfulness vs Control
MORE PRACTICEExtension: if anxiety were measured both before and after treatment and the question
concerned change over time by group, a more complex repeated/mixed analysis could be required.
17. Worked Example: Pre/Post Anxiety
MORE PRACTICEParticipant illustration: A 24→18, B 20→17, C 19→20. The paired analysis preserves these within-
person links and evaluates the average difference.
18. Worked Example: Three Therapy Conditions
MORE PRACTICEFollow-up example: if CBT and mindfulness each differ from wait-list but not from one another,
the correct conclusion is not that all three groups differ.
19. Worked Example: Stress & Sleep
MORE PRACTICEScatterplot example: a cloud rising from lower-left to upper-right suggests a positive association.
A U-shaped cloud would not be well summarized by a simple linear correlation.
20. Worked Example: Categorical Association
MORE PRACTICEPercentage view: online completion = 42/60 = 70%; face-to-face completion = 52/60 ≈ 87%.
Percentages make the direction of the association easier to understand.
21. Worked Example: Multiple Regression
MORE PRACTICECoefficient example: if B = 0.54 for stress, a one-unit increase in stress is associated with an
estimated 0.54-point increase in anxiety, holding the other predictors constant.
22. Choosing Between Similar Tests
MORE PRACTICEFast check: ask (1) what type of outcome do I have, and (2) are observations independent or
related? These two questions eliminate many inappropriate tests.
23. Common Psychology Research Mistakes
MORE PRACTICEExample: deleting legitimate high scores only because p changes from .08 to .04 is not a
defensible exclusion rule. Data-cleaning decisions should be justified independently of the desired result.
24. SPSS Menu Map
MORE PRACTICEWorkflow tip: before clicking OK, check Statistics, Options, Plots or Cells so the output contains
the diagnostics and summaries you actually need for interpretation.
25. Statistical Test Decision Tree
MORE PRACTICEExample route: “Does stress differ across first-, second- and third-year students?” Continuous
stress outcome + three independent year groups → one-way ANOVA as a starting point.
26. Reporting Templates
MORE PRACTICEExample transformation: SPSS gives M1 = 18.4, M2 = 22.7, t = -3.05, df = 58, p = .003. Your report
should turn those numbers into a sentence explaining the group difference.
27. Mini Practice Questions
MORE PRACTICEExtra practice: A single 1-5 satisfaction item is compared between two independent groups.
What measurement issue should you consider before choosing the test?
28. Answer Key
MORE PRACTICEExtra answer: a single Likert item is ordinal; consider whether a rank-based independent-group
comparison is more appropriate than treating the item as continuous.
SPSS for Psychology Students - Research Methods & Statistics Guide
, STUDENTSTATSLAB • PSYCHOLOGY • SPSS • RESEARCH METHODS
29. Final Research Checklist
MORE PRACTICEBefore submission: verify every reported mean, SD, statistic, degree of freedom and p-value
against the final SPSS output, and keep a record of recoding and exclusions.
30. Final Quick Reference
MORE PRACTICEFinal example: social support + anxiety as two quantitative scores suggests correlation;
predicting anxiety from support while adjusting for stress and age suggests regression.
SPSS for Psychology Students - Research Methods & Statistics Guide
