Answered: (a) Find Σx, Σy, Σx2, Σy2, Σxy, and r.…

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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What is the optimal time for a scuba diver to be on the bottom of the ocean? That depends on the depth of the dive. The U.S. Navy has done a lot of research on this topic. The Navy defines the "optimal time" to be the time at each depth for the best balance between length of work period and decompression time after surfacing. Let x = depth of dive in meters, and let y = optimal time in hours. A random sample of divers gave the following data.

x	13.1	23.3	31.2	38.3	51.3	20.5	22.7
y	2.78	2.18	1.48	1.03	0.75	2.38	2.20

(a) Find Σx, Σy, Σx², Σy², Σxy, and r. (Round r to three decimal places.)

Σx =
Σy =
Σx² =
Σy² =
Σxy =
r =

(b) Use a 1% level of significance to test the claim that ρ < 0. (Round your answers to two decimal places.)

t =
critical t =

Conclusion

Reject the null hypothesis. There is sufficient evidence that ρ < 0.Reject the null hypothesis. There is insufficient evidence that ρ < 0. Fail to reject the null hypothesis. There is sufficient evidence that ρ < 0.Fail to reject the null hypothesis. There is insufficient evidence that ρ < 0.

S_e =
a =
b =

(d) Find the predicted optimal time in hours for a dive depth of x = 24 meters. (Round your answer to two decimal places.)
hr

(e) Find an 80% confidence interval for y when x = 24 meters. (Round your answers to two decimal places.)

lower limit	hr
upper limit	hr

(f) Use a 1% level of significance to test the claim that β < 0. (Round your answers to two decimal places.)

t =
critical t =

Conclusion

Reject the null hypothesis. There is insufficient evidence that β < 0.Fail to reject the null hypothesis. There is insufficient evidence that β < 0. Reject the null hypothesis. There is sufficient evidence that β < 0.Fail to reject the null hypothesis. There is sufficient evidence that β < 0.

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