An r 2 value of 0.68 equates to Pearson’s correlation coefficient ( r ) of 0.82, which is widely used as a measure of sample effect size and associated with Student’s t value of 6.87 for 23 degrees of freedom ( n -2, where n = 25), and a corresponding p value of 5.3 × 10 –7 , likely to be significant.
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E‑Liquid and Aerosol Characterization of Popular Disposable E‑Cigarettes.
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