# PSY 210 Quiz 1

 Parameter quantity calculated from a population Statistic quantity calculated from a sample   Sigma: Population Standard Deviation Sigma Symbol for population deviation 2 Sigma Squared: Population Variance Sigma Squared Population Variance mu: population mean mu population mean Population Variance variance of the population - usually estimated, rarely computed Population Set of all objects that we're interested in researching Standard Deviation square root of the variance Sample Subset of the population; set of the actual observations Significance results are unlikely to have occured by chance alone Random Sample each member of the population has an equal chance of being included sample mean s2 Sample Variance s Sample Standard Deviation X Individual Observation; Raw Score Central Limit Theorem (CLT) Given a population with finite mean mu and finite variance sigma squared, the sampling distribution of the mean approaches a normal distribution with the mean mu and variance sigma squared divided by N, as N, the sample size, increases Measures of Central Tendency (3 Ms) Mean Median Mode Mean arithmatic average: The sum of the scores divided by the number of scores Median Middlemost score Mode the most frequently occuring score abscissa x axis; horizontal axis ordinate y axis; vertical axis Histogram bar chart N the number of observations Normal Distribution Bell Curve; Mesokurtic Frequency Distribution Frequency Polygon Skewed Distribution - Skewness a skewed bell curve; a measure of the degree to which a distribution is asymmetrical Kurtosis levelness/flatness around the mode of a frequency distribution Leptokurtosis more scores in the tails and fewer in the middle as compared to the corresponding normal distribution most commom with small sample sizes  Platykurtic Distribution more scores in the middle and fewer scores in the tails as compared to the normal corresponding distribution What type of Distribution is this??? Bimodal What type of Distribution is this??? Leptokurtic Distribution What type of distribution is this???  Uniform Distribution Measures of Dispersion Range Variance Standard Deviation  Range Largest score minus the smallest score Variance average of the square deviations from the mean Z Distribution Standard Normal Distribution Authorblueclues ID161795 Card SetPSY 210 Quiz 1 DescriptionStatistics Ch 1 - 4, 7 Updated2012-07-11T03:03:26Z Show Answers