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Forms of Statistical Relationship
In psychological research, statistical relationships between variables generally take two basic forms: differences between distinct groups or conditions, and correlations between quantitative variables. Researchers utilize descriptive statistics to examine and communicate these relationships in greater detail.
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Research Methods in Psychology - 4th American Edition @ KPU
Related
Correlation Coefficient
Sample Statistic
Descriptive Statistics in Experimental Research
Descriptive Statistics in Non-Experimental Research
Inferential Statistics
Understanding Descriptive Statistics
Scatterplot
Measures of Central Tendency
Measures of Dispersion
Forms of Statistical Relationship
Cohen's
Mean
Standard Deviation
Bar Graph
Line Graph
What is the primary purpose of using descriptive statistics in psychological research?
Match each category of descriptive statistics with the specific goal it accomplishes when a researcher is summarizing their data.
A researcher finds that a distribution of scores on a memory task is negatively skewed, meaning there are a few extremely low scores that pull the tail of the distribution to the left. Arrange the following measures of central tendency in order from the lowest numerical value to the highest numerical value based on this distribution's shape.
In a psychological study where a distribution of scores is highly skewed by a single extreme outlier, the mean is a more valid descriptive statistic than the median for evaluating the typical performance of the sample.
Measures of dispersion, such as the standard deviation and variance, are descriptive statistics used to describe the average scores within a research sample.
Tables in Research Reports
A psychologist studies the sleep patterns of college students and wants to summarize the collected data. Why must the psychologist report both a measure of central tendency (such as the mean) and a measure of dispersion (such as the standard deviation) to provide a complete descriptive summary of the sample's sleep duration?
A researcher records the number of errors made by five participants on a memory task: 3, 8, 2, 5, and 7. The range for this sample is _____.
A research team is summarizing data from a psychology study. Match each descriptive statistic on the left to the research situation on the right where it would be the most appropriate single summary to report.
A researcher reports that two groups of participants completed an identical mood-rating scale (scored 0–100). Group A had a mean of 60 and a standard deviation of 4, while Group B had a mean of 60 and a standard deviation of 22. Although both groups share the same measure of central tendency, a student analyzing these results should conclude that Group B's scores show substantially greater _____ than Group A's scores.
A researcher has collected scores on a stress questionnaire from 80 undergraduate participants and must decide which descriptive statistics to select and report. Arrange the following evaluative steps in the order that best supports an accurate, justified statistical summary of the data.
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Relationships Between Quantitative Variables
Differences Between Groups
What are the two basic forms that statistical relationships between variables generally take in psychological research?
A researcher tracking the exact number of hours participants sleep and their exact scores on a continuous stress scale is examining a statistical relationship in the form of differences between distinct groups.
Match each research scenario or procedure with the specific form of statistical relationship or summary method it represents.
A researcher is investigating the relationship between 'Number of Minutes Exercising' and 'Blood Pressure' readings. Arrange the steps in the correct logical order to analyze and describe the form of this statistical relationship.
When a researcher describes a statistical relationship as a 'difference between groups,' which of the following are they primarily examining?
A researcher evaluates a study that describes the relationship between 'Stress Score' and 'Blood Pressure' as a 'difference between distinct groups' by comparing the average blood pressure of 'High-Stress' versus 'Low-Stress' individuals. The researcher should conclude that a(n) _____ is a more appropriate form for this relationship if both variables are instead treated as quantitative measurements.
In psychological research, researchers utilize _____ statistics to examine and communicate statistical relationships—such as group differences and correlations—in greater detail.
A researcher measures participants' self-reported anxiety on a 1-to-10 scale and their exact heart rate in beats per minute. If the researcher analyzes this relationship as a difference between distinct groups, this is an appropriate application of the forms of statistical relationships.
Match each research activity with the corresponding concept of statistical relationship or summary method it represents.
A researcher is planning a study on the relationship between sleep quality and cognitive performance. Arrange the steps in the correct logical sequence to evaluate and describe this statistical relationship.