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The Need for StatisticsThe Importance of Measurement
Frequency Distributions and Graphical Methods
Frequency DistributionsDefining Some TermsConstructing
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01 level a z score ability algebra average central tendency chance chapter column computational concept conclude confidence interval correlation coefficient data of Table degrees of freedom determine due to sampling example frequency distribution frequency polygon given grade graph height high school I.Q. scores inches indicates individual mathematical measure of central median negative nonparametric normal curve normally distributed norms Note null hypothesis number of pairs number of scores observations obtained difference ordinal parallel forms Pearson percentage percentile rank population mean predict probability procedure random sample regression line relationship reliability researcher sample mean Sample Problem sampling distribution sampling error scale scattergram shown in Table shows significant difference simply skewness square root squared deviations standard deviation standard error statistics subtract sum of squares techniques test scores tion true score tween Type I error variable whole score