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Lecture

# Appendix A- Statistical Methods.docx

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Department
Psychology
Course
PS101
Professor
Lawrence Murphy
Semester
Fall

Description
Appendix A Statistical Methods Statistics don’t lie, but humans do -> but stats can be wrong Statistical Methods: Graphing Data  Frequency distribution  Histogram  Frequency polygon Descriptive Statistics  Used to describe a situation o Measures of central tendency  mean, median (doesn’t have to be a number), mode  Skewed distributions o Negative: when the tail leans to the left (bump is on the right) o Positive: when the tail leans to the right (bump is on the left)  Measuring variability  Standard deviation (for first midterm, don’t need to calculate) o Look at the difference between each value to the average o Square each deviation, add them all up and divide by N o Square root the number o The more variation, the higher the number is going to be Meaning of Symbols  N = the number of scores/ participants/ events  X = the score  ∑ (Sigma) = sum of or “add them up” The Normal Distribution  Used in psychological tests o Relative measures  compared to o
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