Answered: Since the sample size is small, n = 27,…

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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Question

Since the sample size is small, n = 27, a graph is needed to verify whether it is reasonable to believe that the population distribution of differences is approximately normal. Compute the differences in time to descend 800 ft as (Stopped − Windmilling), adding this column to the data set.

?_d = ?₁ − ?₂ = mean difference in time (Stopped − Windmilling)

1. Create and upload a boxplot of the differences.

The author indicated that one of the trials was unusual. In this trial, one flight experienced an updraft of wind that caused an unusually long time to descend 800 ft, making the difference for this pair quite a bit larger than the other pairs. As such, it is reasonable to remove trial number 14 from the data set because the condition of calm winds was not maintained.

2. Delete trial number 14 from the data set. Create and upload a new boxplot of the differences.

Trial Windmilling Stopped
1
2
3
4
5
6
7
8
9
73.4
68.9
74.1
71.7
74.2
63.5
21
64.4
60.9
10 74.5
23
79.5
11 76.5
12 70.3
13
71.3
14 72.7
15
16
17 71.2
64.2
18 75.6
67.5
19 73.1
20 77.4
77
22 77.8
77
24 72.3
25 69.2
26 63.9
27 70.3
82.3
75.8
75.7
71.7
68.8
74.2
78
68.5
90.6
81.9
72.9
75.7
77.6
174.3
82.5
81.1
72.3
77.7
82.6
79.5
82.3
79.5
79.7
73.4
76
74.2
79

Expert Solution

Step 1

Given

The data is as follows:

Trial	Windmilling	Stopped
1	73.4	82.3
2	68.9	75.8
3	74.1	75.7
4	71.7	71.7
5	74.2	68.8
6	63.5	74.2
7	64.4	78
8	60.9	68.5
9	79.5	90.6
10	74.5	81.9
11	76.5	72.9
12	70.3	75.7
13	71.3	77.6
14	72.7	174.3
15	64.2	82.5
16	67.5	81.1
17	71.2	72.3
18	75.6	77.7
19	73.1	82.6
20	77.4	79.5
21	77	82.3
22	77.8	79.5
23	77	79.7
24	72.3	73.4
25	69.2	76
26	63.9	74.2
27	70.3	79