34.7 Quick review questions

A study of Chinese paedatric patients (Wong et al. 2018) studied the relationship between the 6-minute walk distance (6MWD) and maximum oxygen uptake (VO2max) for \(n=29\) patients. The correlation coefficient is reported as \(r=0.457\), and the corresponding \(P\)-value as \(P=0.013\).

  1. The \(x\)-variable is
  2. True or false: Since the \(P\)-value is small, the correlation must be quite strong.
  3. The relationship is best described as
  4. The value of \(R^2\) (to one decimal place, expressed as a percentage) is:
  5. For statistical validity, we need to assume that:


Wong P-F, Chan EY-T, Ng DK-K, Kwok K-L, Yip AY-F, Leung S-Y. Correlation between 6-min walk test and cardiopulmonary exercise test in Chinese patients. Pediatric Respirology and Critical Care Medicine. Medknow Publications; 2018;2(2):32.