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Understanding Descriptive Statistics
Before conducting inferential statistics, researchers must thoroughly understand their data at a descriptive level to clearly see 'what happened' in their study. Even though inferential statistics are required for formal reporting, descriptive statistics alone can provide strong preliminary evidence about whether a treatment worked or if variables are unrelated.
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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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Example of Descriptive Statistics Showing an Effect
Example of Descriptive Statistics Showing No Effect
Inferential Statistics
A researcher conducts a study comparing the test scores of students who studied using flashcards versus those who used re-reading. After collecting data, she calculates the mean and standard deviation for each group and plots a histogram before running any significance tests. Why is this preliminary step valuable, even though inferential statistics are still required for a formal report?
A researcher is reviewing their data summaries before conducting inferential tests. Match each specific descriptive outcome with the primary insight it provides about the study's results.
A psychology researcher has finished collecting data for a study on how a mindfulness intervention affects stress levels. To reach a sound descriptive conclusion about 'what happened' in the study before proceeding to formal reporting, arrange these analytical steps in the correct logical sequence.
Because inferential statistics are the standard for formal reporting in psychology, a researcher is committing a methodological error if they form a preliminary judgment about a treatment's effectiveness based solely on descriptive statistics (such as means, ) before conducting formal significance tests ().
As a lead researcher, you are developing a new training protocol to ensure that junior analysts 'see what happened' in their data before jumping to significance testing. For a study comparing the effects of two different meditation techniques on heart rate, which of the following descriptive summary designs should your protocol require them to formulate?
Before conducting inferential statistics, what is the primary reason researchers must thoroughly understand their data at a descriptive level?
Before conducting inferential statistics, researchers must thoroughly understand their data at a _____ level to clearly see 'what happened' in their study.