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Effect of massage on boxers. Refer to the British Journal of Sports Medicine (Apr. 2000) study of the effect of massaging boxers between rounds, presented in Exercise 11.60 (p. 577). Two variables measured on the boxers were blood lactate level ( y ) and the boxer’s perceived recovery ( x ). The data for 16 five-round boxing performances are reproduced in the table and saved in the BOXING2 file.
a. Rank the values of the 16 blood lactate levels.
b. Rank the values of the 16 perceived recovery values.
c. Use the ranks from parts a and b to compute Spearman’s rank correlation coefficient. Give a practical interpretation of the result.
d. Find the rejection region for a test to determine whether y and x are rank correlated. Use a = .10.
e. What is the conclusion of the test you conducted in part d? State your answer in the words of the problem.
Exercise 11.60
Effect of massage on boxers. Refer to the British Journal of Sports Medicine (Apr. 2000) study of the effect of massage on boxing performance, presented in Exercise 10.72 (p. 518). Two other variables measured on the boxers were blood lactate concentration (in μM) and the boxer’s perceived recovery (on a 28-point scale). On the basis of information provided in the article, the data shown in the accompanying table (and saved in the BOXING2 file) were obtained for 16 five-round boxing performances in which a massage was given to the boxer between rounds. Conduct a test to determine whether blood lactate level ( y ) is linearly related to perceived recovery ( x ). Use a = .10.
Exercise 10.72
Effect of massage on boxers. Eight amateur boxers participated in an experiment to investigate the effect of massage on boxing performance (British Journal of Sports Medicine, Apr. 2000). The punching power of each boxer (measured in newtons) was recorded in the round following each of four different interventions: (M1) in round 1, following a pre-bout sports massage;
(R1) in round 1, following a pre-bout period of rest; (M5) in round 5, following a sports massage between rounds; and (R5) in round 5, following a period of rest between rounds. Based on information provided in the article, the data in the accompanying table were obtained and saved in the BOXING file. The main goal of the experiment was to compare the punching power means of the four interventions.
a. Set up H0 and Ha for this analysis.
b. Identify the treatments and blocks in the experiment.
c. Conduct the test set up in part a. What conclusions can you draw regarding the effect of massage on punching power?
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