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Chapter 15 Statistical Evaluation Of Data
Typology: Exams
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Descriptive Statistics - correct answer โโStatistical methods used to organize, summarize, and simplify the results obtained from research studies. Inferential Statistics - correct answer โโStatistical methods used to determine when it is appropriate to generalize the results from a sample to an entire population. Statistic - correct answer โโA summary value that describes a sample. Parameter - correct answer โโA summary value that describes a population. Central Tendency - correct answer โโA statistical measure that identifies a single score that defines the center of a distribution. It provides a representative value for the entire group. Mean - correct answer โโA measure of central tendency obtained by adding the individual scores and dividing the sum by te number of scores. Median - correct answer โโA measure of central tendency that identifies the score that divides the distribution in half so that 50% of the individuals have scores at or below the median. Mode - correct answer โโA measure of central tendency that identifies the most frequently occurring score in the distribution. Variability - correct answer โโA measure of the size of the spread of score in a distribution. Variance - correct answer โโA measure of variability obtained by computing the average squared distance from the mean.
Standard Deviation - correct answer โโA measure of variability that describes the average distance from the mean; obtained by taking the square root of the variance. Correlation - correct answer โโA statistical value that measures and describes the direction and degree of relationship between two variables. The sign (+/-) indicates the direction of the relationship. The numerical value (0.0 to 1.0) indicates the strength or consistency of the relationship. The type (Pearson or Spearman) indicates the form of the relationship. Also known as correlation coefficient. Regression - correct answer โโA statistical technique used for predicting one variable from another. The statistical process of finding the linear equation that produces the most accurate predicted values for Y using one predictor variable, X. Multiple Regression - correct answer โโA statistical technique used for studying multivariate relationships. The statistical process of finding the linear equation that produces the most accurate predicted values for Y using more than one predictor variable. Sampling Error - correct answer โโThe naturally occurring difference between a sample statistic and the corresponding population parameter. Hypothesis Test - correct answer โโAn inferential statistical procedure that uses sample data to evaluate the credibility of a hypothesis about a population. A hypothesis test determines whether research results are statistically significant. Standard Error - correct answer โโA measure of the average or standard distance between a sample statistic and the corresponding population parameter. Test Statistic - correct answer โโA summary value computed in a hypothesis test to measure the degree to which the sample data are in record with the null hypothesis. Alpha Level, Or Level Of Significance - correct answer โโIn a hypothesis test, the criterion for statistical significance that defines the maximum probability that the research result was obtained simply by chance. Also known as level of significance.
Degrees Of Freedom - correct answer โโdf; The value n-1 when the variance is computed for a sample of n scores. In general, the number of independent elements when a sample statistic is computed Line Graph - correct answer โโA display in which points connected by straight lines show several different means obtained from different groups or treatment conditions. Also used to show different medians, proportions, or other sample statistics Scatter Plot - correct answer โโA graph that shows the data from a correlational study. The two scores for each individual appear as a single point in the graph with the vertical position of the point corresponding to one score and the horizontal position corresponding to the other Pearson Correlation - correct answer โโA correlation used o evaluate linear (straight-line) relationships Spearman Correlation - correct answer โโA correlation used with ordinal data or to evaluate monotonic relationships Regression Equation - correct answer โโThe equation from a regression analysis Slope Constant - correct answer โโIn the liner equation Y = bX + a, b descries the slope of the line (how much Y changes when X is increased by 1 point) Y-Intercept - correct answer โโIn the liner equation Y = bX + a, a, the Y-intercept, is the point at which the line intersects the Y-axis Multiple-Regression Equation - correct answer โโThe resulting equation from a multiple regression analysis Null Hypothesis - correct answer โโIn a hypothesis test, a statement about the population(s) or treatments being studied that says there is no change, no effect, no difference, or no relationship Effect Size - correct answer โโThe measured magnitude of a treatment effect or relationship that is not influenced y factors such as sample size
Cohen's d - correct answer โโA standard measure of effect size computed by dividing the sample mean difference by the sample standard deviation Percentage Of Variance Accounted For - correct answer โโThe percentage of variance for one variable that can be predicted using the known values for the second variable Independent-Measures t Test - correct answer โโIn a between-subjects design, a hypothesis test that evaluates the statistical significance of the mean difference between two separate groups of participants Repeated-Measures t Test - correct answer โโIn a within-subjects or matched-subjects design, a hypothesis test that evaluates the statistical significance of the mean difference between two sets of scores obtained from the same group of particiapnts Single-Factor Analysis Of Variance - correct answer โโOne-Way ANOVA; A hypothesis test that evaluates the statistical significance of the mean differences among two or more sets of scores obtained from a single-factor multiple-group design Parametric Test - correct answer โโA hypothesis test that uses sample means or sample correlations to evaluate a hypothesis about the corresponding population. __________ tests rely on sample data consisting of numerical scores Nonparametric test - correct answer โโA hypothesis test that does not require numerical scores and does not involve a hypothesis about specific population parameters. The chi-square test for independence is an example of a _____________ test Chi-Square Test For Independence - correct answer โโA hypothesis test that evaluates the statistical significance of the differences between proportions for two or more groups of participants Split-Half Reliability - correct answer โโA measure of reliability obtained by splitting the items on a questionnaire or test in half, computing a separate score for each half, and then measuring the degree of consistency between the two scores for a group of participants Spearman-Brown Formula - correct answer โโA formula for computing split-half reliability that corrects for the fact that individual scores are based on only half of the total test items