25 Questions
What is the most commonly used measure of central tendency in statistics?
Mean
What is the easiest way to find the mode of a distribution?
Look for the score with the largest frequency
What is the purpose of descriptive statistics?
To describe the data
What is cross-tabulation?
A way to see the relationship between two nominal or ordinal variables
What is the median of the following distribution: 2, 4, 6, 8, 10?
8
What is the range of Pearson product-moment correlation?
-1.00 to +1.00
When is Spearman rank-order correlation used?
When one variable is ordinal and the second is at least ordinal
What is the purpose of scatter plots?
To identify nonlinear relationships only
What does a correlation coefficient of -0.75 indicate?
A moderate negative relationship
Can Spearman rank-order correlation be used with nominal data?
No
What statistical test should be used to compare the mean differences in two or more groups?
ANOVA
What is the potential consequence of failing to convict a guilty person?
Convicting an innocent person
What is the difference between the t-test for independent samples and the t-test for paired samples?
The t-test for independent samples compares two independent groups, while the t-test for paired samples compares two related groups
What is the null hypothesis in a statistical decision process?
The hypothesis that is assumed to be true
What is the purpose of a statistical decision process?
To provide a framework for making decisions based on data
What is the formula for computing the variance?
Compute the mean, compute the distance of each score from the mean and square that distance, sum those squared distances and divide by the degrees of freedom (N-1)
What is the difference between range and variance?
Range is the lowest to highest score, while variance is the average squared distance from the mean
What is the formula for computing the standard deviation?
Take the square root of the variance
What is the importance of reporting both mean and standard deviation?
It allows for better understanding of the data and the degree of variability
What is the formula for computing the mean?
Sum the numbers and count the numbers
What is the purpose of using a linear regression in inferential statistics?
To find the best fitting straight line for the data
What is the difference between population and sample in inferential statistics?
Population is the larger group of all participants of interest to the researcher, while sample is a subset of the population
What is the purpose of the null hypothesis in inferential statistics?
To state that there is no difference between the population means
What is coefficient alpha used for in inferential statistics?
To index internal consistency reliability
What is the purpose of inferential statistics in research?
To provide an objective way of quantifying the strength of the evidence for our hypothesis
Test your knowledge on Measures of Relationship and Correlation with our quiz! Learn about Pearson and Spearman correlations, when to use them, and how to interpret scatter plots. Explore the range of correlations and understand what negative and positive correlations mean. Sharpen your skills on identifying nonlinear relationships and become an expert in analyzing data. Perfect for students and researchers in the field of statistics!
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