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Sample Statistic
A sample statistic is a descriptive numerical summary—such as a mean or a correlation coefficient—that is calculated from the data of a specific sample. Researchers compute these statistics to summarize their observed data and to make inferences about the corresponding, unknown values in the broader population.
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Research Methods in Psychology - 4th American Edition @ KPU
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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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Population Parameter
Confidence Interval
Probability vs. Statistics
Statistical Estimator
A researcher calculates the average stress level of 45 hospital nurses to be 6.8 on a 10-point scale. Which statement best describes the role of this 6.8 value in the research process?
A health psychologist conducts a study on the effect of a mindfulness app on stress levels among healthcare workers. She recruits 100 nurses from a local hospital to use the app for a month. At the end of the study, she calculates that the nurses' average stress scores decreased by 15%. Match each component of this research study to its correct statistical term.
A social psychologist is investigating the average level of 'burnout' among 500 emergency room nurses. Arrange the following components of the research process in order, starting from the most specific level of data and ending with the broadest level of statistical inference.
In the process of evaluating psychological research, it is a scientifically sound practice to conclude that a sample statistic is the absolute, error-free value of the population parameter, as long as the sample was selected using a random sampling method.
You are designing a research proposal to estimate the average sleep duration of all students at your university (). To create a valid sample statistic that supports this population-level inference, which strategy should you propose in your analysis plan?
A sample statistic is a descriptive numerical summary that is calculated using the data from an entire population.
A descriptive numerical summary, such as a mean or a correlation coefficient, that is calculated from the data of a specific sample is called a _____.
Match each component of the sleep study scenario with its correct statistical description based on the concepts of sample statistics and populations.
An educational psychologist computes the mean test score of 50 students selected from a school. While the sample statistic is an empirical value calculated from observed data, the corresponding unknown value in the broader population that the researcher is trying to estimate is called a population _____.
To evaluate the validity of a statistical claim, a researcher must follow a logical sequence from data collection to population inference. Order the steps of this process, starting with defining the research goal and ending with the final inference.