18 Questions
What is the primary purpose of the null hypothesis in a research study?
To provide a default position to be disproven through the study
What is the main difference between sample variance and population variance?
Sample variance is calculated for a subset of the population, while population variance is calculated for the entire population
What is the role of variance in psychological research?
To understand how individual data points deviate from the central tendency
What is the purpose of dividing the sample standard deviation by the square root of the sample size?
To estimate the standard error of the mean
What is the primary reason for calculating variance in a dataset?
To quantify the spread or dispersion of values within the dataset
What type of research is more concerned with the principles of behavior and mental processes?
Basic research
What is the relationship between rejecting the null hypothesis and the alternative hypothesis?
Rejecting the null hypothesis means there is sufficient evidence to conclude there is a real effect or relationship
What is the primary reason for using statistical methods in psychological research?
To bring up the idea of variance and quantify the spread or dispersion of values
What is the main advantage of within-subjects designs?
The ability to reduce sequencing effects
What is the purpose of using a factorial design in an experiment?
To examine the interaction between multiple independent variables
What is the main difference between experimental and correlational research?
Experimental research involves manipulating variables, while correlational research involves observing naturally occurring variables.
What is the purpose of using a statistical test to assess the fit of a model?
To determine the significance of the model's parameters
What is the primary reason why psychological research often deals with variance?
Because it is impossible to measure human behavior precisely
When should you calculate sample variance?
When your dataset represents a sample taken from a larger population of interest
What is the notation for the sum of the values in the sample?
Σ
What is the purpose of using the formula for estimating population variance?
To estimate the population variance from a sample
Why do we use the unbiased estimate of population variance (/n-1) instead of (/n)?
Because it produces a more accurate estimate of the population variance
What is the assumption made in the first estimator of population variance?
We know the population mean
This quiz explores the differences in measurement precision between sciences like physics and psychology, and how human variability affects the results of experiments. It discusses the importance of understanding the sources of variance in scientific research. Test your knowledge of scientific measurement and experimental design!
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