SE_d = s_d/squareroot n_d t_s = d/SE_d df = n_d-1 In a study on the effect of ca
ID: 3180611 • Letter: S
Question
SE_d = s_d/squareroot n_d t_s = d/SE_d df = n_d-1 In a study on the effect of caffeine on muscle metabolism, nine male volunteers underwent arm exercise tests on two separate occasions. On one occasion, each volunteer took a placebo capsule an hour before the test. On the other occasion, he received a tablet of pure caffeine. The order of taking the pills was randomly assigned for each subject and the RER (respiratory exchange ratio) was measured. (The RER is a ratio, given as a percentage, of CO_2 produced to O_2 consumed.) Perform a nondirectional paired t-test with alpha = 0.01.Explanation / Answer
from above
as p value is lower then 0.01 level, we reject null hypothesis; that they both have similar effect
and conclude that there is siginifcant differnce in their effect of RER
S. NO Placebo Caeffine difference(d) 1 105 96 9 2 119 99 20 3 92 89 3 4 97 95 2 5 96 88 8 6 101 95 6 7 94 88 6 8 95 93 2 9 98 88 10 mean 7.333 std deviaition 5.5902 std error= std dev/(n)^(1/2) 1.8634 t stat= (d-0)/std error 3.9355 p value = 0.0034Related Questions
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