Question

Many baseball sportswriters believe that the key to success in baseball is pitching. One way to measure success in pitching is a team’s Earned Run Average (ERA). The team ERA gives the number of earned runs per game scored by opponents, where the lower the team ERA is, the better a team’s pitching. In the United States, professional baseball is played in a season of 162 games. For the 2013 season, the number of wins (y) and team ERA (x), have been recorded for the 30 teams in major league baseball. To assist you in your calculations, the following have been computed from this data:

n=30 ∑iXi1= 115.90 ∑iXi2=452.4556 ∑iYi1=2,431 ∑iYi2= 201347 ∑iXiYi= 9,284.92

Using the information given, find the least-squares estimators for B0 and B1 and write out the estimated regression line of the number of wins in a season on team ERA.

The data below shows W and ERA

1. 81 3.92

2. 96 3.18

3, 85 4.2

4. 97 3.79

5. 66 4

6. 63 3.98

7. 90 3.38

8. 92 3.82

9. 74 4.44

10. 93 3.61

11. 51 4.79

12. 86 3.45

13. 78 4.23

14, 92 3.25

15. 62 3.71

16. 74 3.84

17. 66 4.55

18. 74 3.77

19. 85 3.94

20. 96 3.56

21. 73 4.32

22. 94 3.26

23. 76 3.98

24. 71 4.31

25. 76 4

26. 97 3.42

27. 92 3.74

28. 91 3.62

29. 74 4.25

30. 86 3.59

Answer #1

predictor (x): team ERA

response (y) = the number of wins (y)

the given data are:-

**the slope
be:-**

**the intercept
be:-**

**the regression
equation be:-**

the number of wins = 168.9454 - 22.7555* team ERA

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Below represent scores on an exam, each entry one score for one
student
40
99
59
98
63
63
64
65
67
35
67
67
68
70
71
71
71
46
72
72
60
73
74
74
74
75
97
75
62
76
76
76
76
76
77
57
77
98
77
63
78
78
78
79
79
80
80
80
80
80
81
81
92
81
93
82
82
83
83
83
83
83
83
83
84
84
84...

Student Grades
Student
Test
Grade
1
76
62
2
84
90
3
79
68
4
88
84
5
76
58
6
66
79
7
75
73
8
94
93
9
66
65
10
92
86
11
80
53
12
87
83
13
86
49
14
63
72
15
92
87
16
75
89
17
69
81
18
92
94
19
79
78
20
60
71
21
68
84
22
71
74
23
61
74
24
68
54
25
76
97...

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s=
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1
63%
13...

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Over your first season selling ice cream, you vary your price
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cream. No one has ever sold ice cream here before, so you have no
idea what the demand will look like. You suspect that people like
to buy more ice cream on hotter days, but you are very unsure about
what price you should charge to maximize your profit.
Over your first season selling ice cream, you vary your price
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cream. No one has ever sold ice cream here before, so you have no
idea what the demand will look like. You suspect that people like
to buy more ice cream on hotter days, but you are very unsure about
what price you should charge to maximize your profit.
Over your first season selling ice cream, you vary your price
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And need to be writing in C++ language
Programm need to start with
#include<fstream>
Prepare a text file data_in.txt with the following information
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