12.3: Chapter 12 - Key Terms and Symbols
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\(\newcommand{\avec}{\mathbf a}\) \(\newcommand{\bvec}{\mathbf b}\) \(\newcommand{\cvec}{\mathbf c}\) \(\newcommand{\dvec}{\mathbf d}\) \(\newcommand{\dtil}{\widetilde{\mathbf d}}\) \(\newcommand{\evec}{\mathbf e}\) \(\newcommand{\fvec}{\mathbf f}\) \(\newcommand{\nvec}{\mathbf n}\) \(\newcommand{\pvec}{\mathbf p}\) \(\newcommand{\qvec}{\mathbf q}\) \(\newcommand{\svec}{\mathbf s}\) \(\newcommand{\tvec}{\mathbf t}\) \(\newcommand{\uvec}{\mathbf u}\) \(\newcommand{\vvec}{\mathbf v}\) \(\newcommand{\wvec}{\mathbf w}\) \(\newcommand{\xvec}{\mathbf x}\) \(\newcommand{\yvec}{\mathbf y}\) \(\newcommand{\zvec}{\mathbf z}\) \(\newcommand{\rvec}{\mathbf r}\) \(\newcommand{\mvec}{\mathbf m}\) \(\newcommand{\zerovec}{\mathbf 0}\) \(\newcommand{\onevec}{\mathbf 1}\) \(\newcommand{\real}{\mathbb R}\) \(\newcommand{\twovec}[2]{\left[\begin{array}{r}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\ctwovec}[2]{\left[\begin{array}{c}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\threevec}[3]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\cthreevec}[3]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\fourvec}[4]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\cfourvec}[4]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\fivevec}[5]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\cfivevec}[5]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\mattwo}[4]{\left[\begin{array}{rr}#1 \amp #2 \\ #3 \amp #4 \\ \end{array}\right]}\) \(\newcommand{\laspan}[1]{\text{Span}\{#1\}}\) \(\newcommand{\bcal}{\cal B}\) \(\newcommand{\ccal}{\cal C}\) \(\newcommand{\scal}{\cal S}\) \(\newcommand{\wcal}{\cal W}\) \(\newcommand{\ecal}{\cal E}\) \(\newcommand{\coords}[2]{\left\{#1\right\}_{#2}}\) \(\newcommand{\gray}[1]{\color{gray}{#1}}\) \(\newcommand{\lgray}[1]{\color{lightgray}{#1}}\) \(\newcommand{\rank}{\operatorname{rank}}\) \(\newcommand{\row}{\text{Row}}\) \(\newcommand{\col}{\text{Col}}\) \(\renewcommand{\row}{\text{Row}}\) \(\newcommand{\nul}{\text{Nul}}\) \(\newcommand{\var}{\text{Var}}\) \(\newcommand{\corr}{\text{corr}}\) \(\newcommand{\len}[1]{\left|#1\right|}\) \(\newcommand{\bbar}{\overline{\bvec}}\) \(\newcommand{\bhat}{\widehat{\bvec}}\) \(\newcommand{\bperp}{\bvec^\perp}\) \(\newcommand{\xhat}{\widehat{\xvec}}\) \(\newcommand{\vhat}{\widehat{\vvec}}\) \(\newcommand{\uhat}{\widehat{\uvec}}\) \(\newcommand{\what}{\widehat{\wvec}}\) \(\newcommand{\Sighat}{\widehat{\Sigma}}\) \(\newcommand{\lt}{<}\) \(\newcommand{\gt}{>}\) \(\newcommand{\amp}{&}\) \(\definecolor{fillinmathshade}{gray}{0.9}\)Glossary of Key Terms and Symbols
Key Terms
Alternative Hypothesis: The statement that at least one group mean is different from the others. It contrasts with the null hypothesis in ANOVA.
Between-Group Variance: A measure of variability between the means of different groups. It reflects how much the group means differs from the grand mean.
Degrees of Freedom: The number of independent values that can vary in an analysis. ANOVA has degrees of freedom for between-group, within-group, and total variation.
Dependent Variable: The variable being measured or tested in the experiment. It is affected by changes in the independent variable.
F-Distribution: A probability distribution used in ANOVA to compare variances. It is skewed right and used to determine critical values in F-tests.
F-Ratio: The test statistic in ANOVA, calculated by dividing the between-group variance by the within-group variance.
F-Test: A statistical test that compares the variances of two or more groups to determine if at least one group mean is different.
Grand Mean: The overall mean of all the data points from all groups combined.
Independent Variable: The variable that is manipulated or categorized to observe its effect on the dependent variable. It defines the groups being compared.
Level of Significance: The probability threshold (commonly denoted as alpha, such as 0.05) used to decide whether to reject the null hypothesis.
Mean Square: The variance estimate in ANOVA, calculated by dividing the sum of squares by the corresponding degrees of freedom. Includes between-group and within-group mean squares.
Null Hypothesis: The statement that all group means are equal. It is tested against the alternative hypothesis in ANOVA.
One-Way ANOVA: An analysis of variance method used to compare means across one independent variable with two or more levels or groups.
Within-Group Variance: A measure of variability within each group. It reflects differences among individual scores in the same group.
Key Symbols
\( \bar{x} \) – sample mean of a group
\( \bar{x}_{GM} \) – grand mean (mean of all data across all groups)
\( k \) – number of groups or levels of the independent variable
\( n \) – number of observations per group
\( N \) – total number of observations across all groups
\( S^2_B \) – Between-group variance.
\( S^2_W \) – within group variance
\( dfn \) – degrees of freedom of the numerator (\( k - 1 \))
\( dfd \) – degrees of freedom of the denominator (\( N - k \))
\( F \) – F-ratio or test statistic (\( S^2_B / S^2_W \))
\( \alpha \) – significance level (probability of Type I error)
\( p \) – p-value.
Authors
"12.3: Chapter 12 - Key Terms and Symbols" by Toros Berberyan, Tracy Nguyen, and Alfie Swan is licensed under CC BY 4.0