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Example of Sample Statistics and Population Parameters
In psychological research, investigators calculate statistics from a specific group to estimate corresponding values in a larger group. For instance, if a researcher studies adults with clinical depression and calculates their average number of depressive symptoms, this calculated average is a sample statistic. The researcher then uses this statistic to draw conclusions about the corresponding population parameter, which is the true average number of depressive symptoms for all adults living with clinical depression.
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Research Methods in Psychology - 4th American Edition @ KPU
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Example of Sample Statistics and Population Parameters
Which of the following best defines a population parameter in psychology research?
In a study on workplace stress, the average stress level calculated from 200 surveyed employees is a population parameter for all employees in that industry.
In psychological research, population parameters represent numerical characteristics of the entire group of interest. Match each research objective with the specific type of population parameter that would describe that whole-group characteristic.
In psychological research, different numerical values provide varying levels of certainty about a whole group. Analyze the following data sources and arrange them in order from the value that would fluctuate the most if you repeated the study with new people, to the value that is the constant, true measure of the whole group (the population parameter).
A researcher surveys 150 university students and calculates a mean anxiety score of 42.3 for that group. The researcher's actual goal is to describe the anxiety level of all students enrolled at the university. Which of the following correctly identifies the population parameter in this study?
A numerical value that represents a specific characteristic of an entire population is called a population _____.
A researcher conducts a study on a group of students and finds a correlation of . They then publish a report claiming that is the 'actual, fixed correlation' for every student in the university system. When evaluating this report, a methodologist would argue that the researcher is incorrectly presenting a sample statistic as if it were a _____, which is the true, fixed numerical characteristic of the entire university population.
A researcher wants to study the relationship between sleep deprivation and cognitive performance in all working nurses in a state. Because they cannot test every nurse, they measure 150 nurses. If the researcher finds that the correlation in their sample is and uses this to estimate the correlation for the entire population of nurses in the state, the correlation of is a sample statistic, while the unknown true correlation of all nurses in the state is the population parameter.
A team of psychologists is researching social media usage patterns. Analyze the components of their research design and match each specific description to its corresponding concept.
Evaluate the methodological workflow for using sample data to make inferences about a population. Arrange the steps in the correct chronological order from the initial phase of identifying the target group to the final inference.
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A researcher studies the sleep habits of 30 children with ADHD and finds they sleep an average of 6 hours per night. The researcher then uses this finding to estimate the average sleep duration for the entire population of children with ADHD. Which of the following correctly identifies the sample statistic and the population parameter?
A health psychologist wants to estimate the average daily water intake of all adults living in a specific city. She randomly surveys 200 adults and finds that their average daily intake is 1.8 liters. Match each research component from this scenario to its correct definition.
A developmental psychologist is conducting a study to determine the average attention span of all preschoolers in North America. Arrange the following steps in the correct logical order to demonstrate how a researcher analyzes data from a specific group to draw conclusions about the broader population.
A psychologist calculates that the average stress level of college students is on a -point scale. If the psychologist then labels this value as the 'population parameter,' they have provided a conceptually accurate evaluation of the relationship between their sample and the larger population of all college students.
When a researcher calculates the average number of symptoms for a specific group of participants, what is the primary purpose of this sample statistic?
In psychological research, if a researcher already knows the exact population parameter for a large group of interest, they must still calculate a sample statistic from a subset of that group to estimate the true value.
A researcher measures the average number of depressive symptoms in a group of 50 adults diagnosed with clinical depression. This calculated average is referred to as a _____.
A clinical psychologist conducts a study on adults diagnosed with major depressive disorder. Match each element of the research scenario to the correct statistical or methodological label.
A researcher studying generalized anxiety disorder measures worry-time per day in therapy clients and obtains a mean of hours. This value qualifies as a sample statistic rather than a population parameter because it was computed from a _____ group of individuals, not from every adult with generalized anxiety disorder.
A researcher wants to use a sample statistic to justify a conclusion about a population parameter. Arrange the following evaluative steps in the order a critical researcher should apply them to judge whether the inference from sample to population is sound.
Define the terms 'sample statistic' and 'population parameter' as they are used in psychological research. Using the example of a researcher studying a group of adults with clinical depression, recall how these two terms apply and describe the relationship between them.
Explain how the psychologist is using statistical estimation in this study. In your explanation, identify the specific group and value that represent the sample statistic, and the larger group and value that represent the population parameter.
A researcher measures the average daily screen time of a specific group of college students and obtains a value of hours. If the researcher uses this value to draw conclusions about the true average daily screen time of all college students, identify what represents the sample statistic and what represents the population parameter in this scenario.