Exam 2 Review

Exam 2 Review - Compare and contrast descriptive...

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Compare and contrast descriptive statistics and inferential statistics Compare and contrast quantitative data and qualitative data Define and contrast continuous versus discrete variables Be able to identify the independent variable (IV) and the dependent variables (DV) Compare and contrast population versus sample Normal distribution Bimodal distribution Positively skewed distribution Negatively skewed distribution What are the three measures of central tendency? - Mode: most commonly occurring score - Median: midpoint score: (remember also the 50th percentile) - Mean: average score How do you calculate each, and when are you likely to use each? In a normal curve what score falls at the 50 th percentile (mean, median and mode) How do they order themselves on a normal distribution, a positively skewed distribution and a negatively skewed distribution? Sample data Population data Sample mean (x) or (M) Population mean ( μ ) Sample size (n) Population size (N) Measures of variability Range Variance Standard deviation Describe relationship between variance and standard deviation (Variance is just square of standard deviation) Sample standard deviation (s) Population standard deviation ( σ ) What is the definitional formula for the standard deviation? Be able to find the standard deviation with definitional and computational formula Normal curve In a normal curve what score falls at the 50 th percentile (mean, median and mode) Define the characteristics of the normal curve

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Normal distribution What is the probability that a score will fall between -1 and +1 standard deviation of the mean? - 68% - notice, z = 1 What is the probability that a score will fall between -2 and +2 standard deviation of the mean? - 95.44% - notice, z = 2 What is the probability that a score will fall between -3 and +3 standard deviation of the mean? - 99.7% - notice, z = 3 z score = raw score - mean standard deviation What is the z scores associated with exactly
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Exam 2 Review - Compare and contrast descriptive...

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