Scientists performed an experiment to determine in myocardial blood flow (MBF) w
ID: 3150615 • Letter: S
Question
Scientists performed an experiment to determine in myocardial blood flow (MBF) was associated with hypoxia. MBF was measured on two groups of subjects randomly assigned to experimental treatments. One treatment, Normoxia (Control) involved subjects breathing normal air; the other treatment, Hypoxia, involved subjects breathing a gas mixture with reduced oxygen to simulate air at high altitude. MBF was measured on subjects in both groups after 5 minutes of bicycle exercise to understand how attitudinal hypoxia might influenced exercise physiology. Relevant results from this study are shown in the table below.
(Namdar et al. 2006)
If the researchers had no idea how hypoxia would affect MBF prior to the experiment, which set of null and alternative hypotheses would be most correct?
a. Null hypothesis: The normoxia and hypoxia population means are equal.
Alternative hypothesis: The normoxia population mean is greater than the hypoxia population mean.
b. Null hypothesis: The normoxia and hypoxia population means are equal.
Alternative hypothesis: The normoxia population mean is less than the hypoxia population mean.
c. Null hypothesis: The normoxia and hypoxia sample means are equal.
Alternative hypothesis: The normoxia sample mean is greater than the hypoxia sample mean.
d. Null hypothesis: The normoxia and hypoxia sample means are equal.
Alternative hypothesis: The normoxia and hypoxia sample means are unequal.
e. Null hypothesis: The normoxia and hypoxia population means are equal.
Alternative hypothesis: The normoxia and hypoxia population means are unequal.
f. Null hypothesis: The normoxia and hypoxia sample means are equal.
Alternative hypothesis: The normoxia sample mean is less than the hypoxia sample mean.
Myocardial blood flow (MBF), ml/min/g Normoxia 3.45 3.09 3.09 2.65 2.49 2.33 2.28 2.24 2.17 1.34 y = 2.51 s = 0.60 Hypoxia 6.37 5.69 5.58 5.27 5.11 4.88 4.68 3.50 y = 5.14 s = 0.84Explanation / Answer
Null hypothesis: The normoxia and hypoxia population means are equal.
Alternative hypothesis: The normoxia and hypoxia population means are unequal.
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