Answered: Eight subjects were asked to perform a…

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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Eight subjects were asked to perform a simple puzzle-assembly task under customary conditions and under conditions of stress. During the stressful condition, the subjects were told that a mild shock would be delivered 3 minutes after the start of the experiment and every 30 seconds thereafter until the task is completed. Blood pressure readings were taken under both conditions. The data are recorded in Table 2 below. We wish to estimate the difference of means with a 95 percent confidence interval.

a. Degrees of freedom and t-value are

b. Margin of error and confidence interval

c. We may state with 95 percent confidence that average blood pressure during conditions of stress is

i. Significantly different from average blood pressure during normal conditions

ii. Not significantly different from average blood pressure during normal conditions

Subject 1
6 7
4| 5
Normal 126 117 115 | 118 | 118 | 128 | 125 120
2
3
8
Stress 130 118 125 120 130
121 125
120
Table 2: Blood pressures of 8 test subjects.

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