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MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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e,f,g

Aviation and high-altitude physiology is a specialty in the study of medicine. Let x = partial pressure of oxygen in the alveoli (air cells in the lungs) when breathing naturally available air.
Let y = partial pressure when breathing pure oxygen. The (x, y) data pairs correspond to elevations from 10,000 feet to 30,000 feet in 5000 foot intervals for a random sample of
volunteers. Although the medical data were collected using airplanes, they apply equally well to Mt. Everest climbers (summit 29,028 feet).
6.7
42.0
(units: mm Hg/10)
(units: mm Hg/10)
4.9
4.2
3.3
2.1
34.5
26.2
16.2
13.9
(a) Verify that Ex = 21.2, Ey = 132.8, Ex? = 101.84, Ey? = 4096.34, Exy = 643.14, and r- 0.971.
Ex
£y
Exy
(b) Use a 1% level of significance to test the claim that p > 0. (Use 2 decimal places.)
critical t
Conclusion
Reject the null hypothesis, there is sufficient evidence that p > 0.
Reject the null hypothesis, there is insufficient evidence that p > 0.
O Fail to reject the null hypothesis, there is insufficient evidence that p > 0.
O Fail to reject the null hypothesis, there is sufficient evidence that p > 0.
(c) Verify that S, - 3.3059, a - -1.844, and b - 6.699.
(d) Find the predicted pressure when breathing pure oxygen if the pressure from breathing available air is x = 4.3. (Use 2 decimal places.)
(e) Find a 90% confidence interval for y when x = 4.3. (Use 1 decimal place.)
lower limit
upper limit
(f) Use a 1% level of significance to test the claim that 6 > 0. (Use 2 decimal places.)
critical t
Conclusion
Reject the null hypothesis, there is sufficient evidence that ß > 0.
Reject the null hypothesis, there is insufficient evidence that B > 0.
Fail to reject the null hypothesis, there is insufficient evidence that ß > 0.
Fail to reject the null hypothesis, there is sufficient evidence that 6 > 0.
(g) Find a 90% confidence interval for ß and interpret its meaning. (Use 2 decimal places.)
lower limit
upper limit
Interpretation
O For a one-unit increase in oxygen pressure breathing only available air, the oxygen pressure breathing pure oxygen increases by an amount that falls within the confidence
interval.
O For a one-unit increase in oxygen pressure breathing only available air, the oxygen pressure breathing pure oxygen decreases by an amount that falls outside the confidence
interval.
O For a one-unit increase in oxygen pressure breathing only available air, the oxygen pressure breathing pure oxygen increases by an amount that falls outside the confidence
interval.
O For a one-unit increase in oxygen pressure breathing only available air, the oxygen pressure breathing pure oxygen decreases by an amount that falls within the confidence
interval.
Transcribed Image Text:Aviation and high-altitude physiology is a specialty in the study of medicine. Let x = partial pressure of oxygen in the alveoli (air cells in the lungs) when breathing naturally available air. Let y = partial pressure when breathing pure oxygen. The (x, y) data pairs correspond to elevations from 10,000 feet to 30,000 feet in 5000 foot intervals for a random sample of volunteers. Although the medical data were collected using airplanes, they apply equally well to Mt. Everest climbers (summit 29,028 feet). 6.7 42.0 (units: mm Hg/10) (units: mm Hg/10) 4.9 4.2 3.3 2.1 34.5 26.2 16.2 13.9 (a) Verify that Ex = 21.2, Ey = 132.8, Ex? = 101.84, Ey? = 4096.34, Exy = 643.14, and r- 0.971. Ex £y Exy (b) Use a 1% level of significance to test the claim that p > 0. (Use 2 decimal places.) critical t Conclusion Reject the null hypothesis, there is sufficient evidence that p > 0. Reject the null hypothesis, there is insufficient evidence that p > 0. O Fail to reject the null hypothesis, there is insufficient evidence that p > 0. O Fail to reject the null hypothesis, there is sufficient evidence that p > 0. (c) Verify that S, - 3.3059, a - -1.844, and b - 6.699. (d) Find the predicted pressure when breathing pure oxygen if the pressure from breathing available air is x = 4.3. (Use 2 decimal places.) (e) Find a 90% confidence interval for y when x = 4.3. (Use 1 decimal place.) lower limit upper limit (f) Use a 1% level of significance to test the claim that 6 > 0. (Use 2 decimal places.) critical t Conclusion Reject the null hypothesis, there is sufficient evidence that ß > 0. Reject the null hypothesis, there is insufficient evidence that B > 0. Fail to reject the null hypothesis, there is insufficient evidence that ß > 0. Fail to reject the null hypothesis, there is sufficient evidence that 6 > 0. (g) Find a 90% confidence interval for ß and interpret its meaning. (Use 2 decimal places.) lower limit upper limit Interpretation O For a one-unit increase in oxygen pressure breathing only available air, the oxygen pressure breathing pure oxygen increases by an amount that falls within the confidence interval. O For a one-unit increase in oxygen pressure breathing only available air, the oxygen pressure breathing pure oxygen decreases by an amount that falls outside the confidence interval. O For a one-unit increase in oxygen pressure breathing only available air, the oxygen pressure breathing pure oxygen increases by an amount that falls outside the confidence interval. O For a one-unit increase in oxygen pressure breathing only available air, the oxygen pressure breathing pure oxygen decreases by an amount that falls within the confidence interval.
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