Statistically Speaking
This measure of central tendency is most affected by extreme scores.
What is the mean?
This is the probability of making a Type I error.
What is alpha (α)?
A correlation of +1.0 means this.
What is a perfect positive relationship?
This test compares the means of two independent groups.
What is an independent t-test?
This test compares observed frequencies to expected frequencies.
What is chi-square?
This type of statistics is used to make generalizations from a sample to a population.
What is inferential statistics?
The hypothesis stating âthere is no differenceâ is known as this.
What is the null hypothesis?
This statistic tells you the strength of linear association between two variables.
What is the correlation coefficient (r)?
The t statistic and this correlation coefficient are mathematically related.
What is r?
This nonparametric test compares two related samples, often used instead of a paired t-test.
What is the Wilcoxon signed-rank test?
Youâd use this type of sampling when every member of a population has an equal chance of being selected.
What is random sampling?
This value describes how meaningful your results are, regardless of statistical significance.
What is effect size?
This type of regression predicts binary rather than continuous outcomes.
What is logistic regression?
Comparing more than two means at once calls for this test.
What is ANOVA?
Instead of using means, these tests rely on this form of data.
What are ranks?
The âspreadâ of scores around the mean is called this.
What is variability?
Increasing your sample size usually increases this important concept.
What is statistical power?
This statistical technique is used to model the relationship between two or more independent variables one dependent variable.
What is multiple linear regression?
This statistical control technique adjusts for preexisting differences among groups.
What is ANCOVA?
This nonparametric correlation assesses monotonic relationships between variables.
What is Spearmanâs rho?
When you justify a design choice after data collection instead of planning it beforehand, youâre guilty of this.
What is a post hoc justification?
Rejecting the null when itâs actually true means youâve committed this statistical sin.
What is a Type I error?
When one variable changes the strength or direction of a relationship between two others, itâs called this.
What is a moderator?
The increased probability of making a Type I error when conducting multiple comparisons is called this.
What is experiment-wise (or family-wise) error rate?
This nonparametric test is the equivalent of a one-way ANOVA.
What is the KruskalâWallis test?