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Formula for the One-Sample t-Test
To conduct a one-sample -test, researchers compute the statistic using the exact formula: . In this mathematical equation, represents the sample mean, is the hypothetical population mean serving as the standard of comparison, is the standard deviation of the sample, and indicates the total sample size.
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Research Methods in Psychology - 4th American Edition @ KPU
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Null Hypothesis
Alternative Hypothesis
Assumptions
Formula for the One-Sample t-Test
Dependent-Samples t-Test
Null and Alternative Hypotheses for the One-Sample t-Test
Degrees of Freedom (One-Sample t-Test)
Example of a One-Sample t-Test
What is the primary purpose of a one-sample t-test?
Match each component of the one-sample t-test to its correct description.
A cognitive psychologist is investigating whether the average reaction time of 50 video game players differs from the general population mean of 300 milliseconds. Arrange the following steps of a one-sample t-test in the correct logical order for this study.
A clinical psychologist is conducting a one-sample t-test to compare the average anxiety scores of patients in a new treatment program to a known population mean. If the psychologist observes that the standard deviation within the sample is larger than expected, while the difference between the sample mean and the population mean remains the same, the resulting t-statistic will be closer to zero.
A researcher conducts a one-sample -test to compare the mean stress scores of a sample of emergency room nurses () to the known general population average (). Despite obtaining a statistically significant result () due to a large sample size, the researcher evaluates the finding as having low practical importance because the calculated _____ was only , indicating a negligible magnitude of difference.
Based on the definition of a one-sample -test, which statistical values are compared in this procedure?
In a one-sample -test, the alternative hypothesis is formulated as , which states that the true population mean differs from the hypothesized value.
A health psychologist is investigating university students' accuracy in estimating the calories in a chocolate chip cookie (which actually has 250 calories). Match each element of this study to its corresponding role in a one-sample -test.
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When computing the statistic for a one-sample -test using the formula , what does the symbol represent?
In the formula for the one-sample -test, each mathematical symbol represents a specific component of the research data. Match each symbol from the equation with the descriptive role it fulfills in a psychological study.
A researcher uses the one-sample -test formula to evaluate the effectiveness of a new clinical intervention. Assuming the difference between the sample mean () and the population mean () is the same in every scenario, arrange the following data profiles in order from the one that produces the lowest statistic (top) to the one that produces the highest statistic (bottom).
Based on the formula , a researcher is justified in concluding that a statistically significant result is practically important whenever the sample size () is sufficiently large, even if the absolute difference between the sample mean () and the population mean () is negligible.
A psychologist conducts a study and uses the formula for the one-sample -test, , to analyze the data. In this formula, the symbol represents the standard deviation of the population.
When a psychologist conducts a one-sample -test using the formula , what is the conceptual role of the denominator, ?
A researcher applies the one-sample -test formula to a memory study. The hypothetical population mean is , the sample mean is , the sample standard deviation is , and the sample size is . The calculated value for this sample is _____.
A health psychologist is calculating a one-sample -test using the formula for a study where the sample mean () is 212, the hypothetical population mean () is 250, the sample standard deviation () is 39.17, and the sample size () is 10. Match each symbol from the equation to its corresponding value or description from this study.
According to the formula for the one-sample -test, if a researcher increases the sample standard deviation () while keeping the sample mean (), hypothetical population mean (), and sample size () constant, the absolute value of the calculated statistic will _____.
Order the steps of mathematical calculations for computing a one-sample statistic using the formula from the initial step to the final division.