4) Myocardial blood flow (MBF) was measured on groups of subjects after 5 minutes of bicycle exercise. The subjects were randomly assigned to one of two groups: the "normoxia" group was provided normal air to breathe while the "hypoxia" group was provided with a gas mixture with reduced oxygen to simulate high altitude. Please determine if the hypoxia group had a significantly higher MBF than the normoxia group. You must choose the correct t-Test from the attached output. Normoxia | Hypoxia 3.46 | 3.37 3.09 | 3.69 2.57 | 2.58 2.85 | 3.01 2.49 | 5.11 2.33 | 2.07 3.51 | 3.50 Mean = 2.90 | Mean = 3.33 Std. Dev = 0.470 | Std. Dev = 0.964
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First, we need to determine which t-test to use. Since we have two independent groups (normoxia and hypoxia), we will use an independent samples t-test. Show moreā¦
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Myocardial blood flow (MBF) was measured for two groups of subjects after five minutes of bicycle exercise. The normoxia ("normal oxygen") group was provided normal air to breathe, whereas the hypoxia group was provided with a gas mixture with reduced oxygen to simulate high altitude. The results (ml/min/g) are shown in the table below. NORMOXIA X HYPOXIA Y 3.45 6.37 3.09 5.69 3.09 5.58 2.65 5.27 2.49 5.11 2.33 4.88 2.28 4.68 2.24 3.50 n 8 8 Sample mean 2.7 5.13 Sample sd 0.45 0.84 We wish to investigate the effect of hypoxia on MBF. (a) Construct a 90% confidence interval for the difference of the mean MBF for the two groups, i.e. Ī¼Y ā Ī¼X. (b) Use the above confidence interval to conduct a hypothesis test with Ī± = 0.10.
Adi S.
Vectorcardiography In each of the following questions the heart voltage vector of a patient with different pathologies is given. Determine the electrocardiograph reading that would result in each of the three leads of Einthoven's triangle, and draw a sketch like that in Figure 7. Recall from Example 7 that vector representations of the sides of Einthoven's triangle are $$\begin{array}{c}{\mathbf{I}_{1}=[1,0] \quad \mathbf{I}_{2}=[1 / 2,-\sqrt{3} / 2]} \\ {\mathbf{I}_{3}=[-1 / 2,-\sqrt{3} / 2]}\end{array}$$ $$\begin{array}{l}{\text { (a) Left anterior hemiblock: } \mathbf{h}=[0.3,0.2]} \\ {\text { (b) Left posterior hemiblock: } \mathbf{h}=[-0.3,-0.2]} \\ {\text { (c) Apical ischemia: } \mathbf{h}=[-0.3,0.2]} \\ {\text { (d) Chronic obstructive pulmonary disease: }}\end{array}$$ $$\mathbf{h}=[0.1,-0.0667]$$
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Twenty-five men between the ages of 25 and 30 , who were participating in a well-known heart study carried out in New Delhi, were randomly selected. Of these, $$ egin{array}{l|l|l|l|l|l|l|l|l|l|l|l|l|l|l} hline ext { Smokers } & 124 & 134 & 136 & 125 & 133 & 127 & 135 & 131 & 133 & 125 & 118 & & & \ hline ext { Nonsmokers } & 130 & 122 & 128 & 129 & 118 & 122 & 116 & 127 & 135 & 120 & 122 & 120 & 115 & 123 \ hline end{array} $$ 11 were smokers, and 14 were not. The data refer to readings of their systolic blood pressure. Use the data to test the hypothesis that the mean blood pressures of smokers and nonsmokers are the same at $5 %$ level of significance.
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