Arterial blood gas analyses were performed on a sample of 15 physically active a

Question

Arterial blood gas analyses were performed on a sample of 15 physically active adult males. The sample mean PaO2 was 79.4 torr, with a standard deviation of 5.9 torr. Do these data suggest that the population mean PaO2 for active adult males is greater than 75 torr? a) Use the one sample t-test to test H_0: mu = 75 vs. H_A: mu > 75. What do you conclude? b) Construct a 95% confidence interval for the mean PaO2 for physically active adult males. c) Consider the normal quantile (Q-Q) plot for the PaO2 values given at the right. Is It reasonable to conclude that these data are normally distributed? Why or why not?

Explanation / Answer

One-Sample T

Test of = 75 vs > 75

N Mean StDev SE Mean T P
15 79.40 5.90 1.52 2.89 0.006

a. P-value < 0.05 we reject null hypothesis. we conclude that data suggest that active adult male is Greater than 75 torr.

b.

N Mean StDev SE Mean 95% CI
15 79.40 5.90 1.52 (76.13, 82.67)   

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