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A researcher conducts a study examining the relationship between exercising at a gym and quality of life in elders over 70 years of age. There appears to be no statistically significant relationship. Then the researcher analyzes the data again, this time comparing number of times a week the participant goes to the gym and quality of life and finds that there is a statistically significant relationship. This is an example of which of the following?
Sample Size
The number of observations or data points in a statistical sample.
Test Power
The probability of correctly rejecting the null hypothesis, effectively detecting an actual effect when it truly exists.
Type II Error
A statistical error made by failing to reject a false null hypothesis (a false negative).
Standard Deviation
A measure of the dispersion or variation in a distribution, indicating how much the individual data points deviate from the mean.
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