Question A study of the effect of caffeine on muscle metabolism used eighteen male volunteers who each underwent arm exercise tests. Nine of the men were randomly selected to take a capsule containing pure caffeine one hour before the test. The other men received a placebo capsule. During each exercise the subject's respiratory exchange ratio (RER) was measured. (RER is the ratio of CO2 produced to O2 consumed and is an indicator of whether energy is being obtained from carbohydrates or fats). Does the data provide evidence that caffeine does, on average, reduce RER?       Placebo Caffeine   104 96   119 100   100 94   97 89   98 96   103 93   94 89   95 105   98 88 Mean 100.89 94.44 Variance 57.11 31.28

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A study of the effect of caffeine on muscle metabolism used eighteen male volunteers who each underwent arm exercise tests. Nine of the men were randomly selected to take a capsule containing pure caffeine one hour before the test. The other men received a placebo capsule. During each exercise the subject's respiratory exchange ratio (RER) was measured. (RER is the ratio of CO2 produced to O2 consumed and is an indicator of whether energy is being obtained from carbohydrates or fats). Does the data provide evidence that caffeine does, on average, reduce RER?

 

 

 

Placebo

Caffeine

 

104

96

 

119

100

 

100

94

 

97

89

 

98

96

 

103

93

 

94

89

 

95

105

 

98

88

Mean

100.89

94.44

Variance

57.11

31.28

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1. A study of the effect of caffeine on muscle metabolism used eighteen male volunteers who
each underwent arm exercise tests. Nine of the men were randomly selected to take a
capsule containing pure caffeine one hour before the test. The other men received a placebo
capsule. During each exercise the subject's respiratory exchange ratio (RER) was measured.
(RER is the ratio of CO2 produced to 02 consumed and is an indicator of whether energy is
being obtained from carbohydrates or fats). Does the data provide evidence that caffeine
does, on average, reduce RER?
Placebo
Caffeine
104
96
119
100
100
94
97
89
98
96
103
93
94
89
95
105
98
88
Mean
100.89
94.44
Variance
57.11
31.28
Null hypothesis:
Alternative hypothesis:
Computation for t:
Transcribed Image Text:ginfile.php 1 / 1 100% 1. A study of the effect of caffeine on muscle metabolism used eighteen male volunteers who each underwent arm exercise tests. Nine of the men were randomly selected to take a capsule containing pure caffeine one hour before the test. The other men received a placebo capsule. During each exercise the subject's respiratory exchange ratio (RER) was measured. (RER is the ratio of CO2 produced to 02 consumed and is an indicator of whether energy is being obtained from carbohydrates or fats). Does the data provide evidence that caffeine does, on average, reduce RER? Placebo Caffeine 104 96 119 100 100 94 97 89 98 96 103 93 94 89 95 105 98 88 Mean 100.89 94.44 Variance 57.11 31.28 Null hypothesis: Alternative hypothesis: Computation for t:
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