Question

In: Psychology

After watching the Superbowl, Steve is convinced that the referees are often blind, blowing calls that...

After watching the Superbowl, Steve is convinced that the referees are often blind, blowing calls that greatly influence teams’ chances of winning. To test his idea, Steve chooses ten NFL teams at random and watches every single game in a season for those ten teams. He records the number of blown calls going against each team (regardless of whether he is a fan of the team!). He also records the winning percentages of each of those ten teams at the end of the season. He is most interested in knowing whether the number of blown calls going against each team predicts those teams’ winning percentages. Using Steve’s dataset below, provide your hand calculations to answer the questions that follow.

Blown Calls (X)

Winning Percentage (Y)

X2

Y2

XY

        50       

78

2500

6084

3900

61

83

3721

6889

5063

66

55

4356

3025

3630

69

73

4761

5329

5037

73

49

5329

2401

3577

74

59

5476

3481

4366

79

39

6241

1521

3081

80

45

6400

2025

3600

85

47

7225

2209

3995

110

32

12100

1024

3520

Total

747

560

58109

33998

39769

Steve’s favorite team had only 60 blown calls against them this season. What would you predict Steve’s team’s winning percentage to be?

Solutions

Expert Solution

Blown Calls (X)

Winning Percentage (Y)

X2

Y2

XY

        50       

78

2500

6084

3900

61

83

3721

6889

5063

66

55

4356

3025

3630

69

73

4761

5329

5037

73

49

5329

2401

3577

74

59

5476

3481

4366

79

39

6241

1521

3081

80

45

6400

2025

3600

85

47

7225

2209

3995

110

32

12100

1024

3520

Total

747

560

58109

33998

39769

using this data

we can calculate the regression intercept (a) and then on the basis of that we can it to find y for a certain value of x

Now we calculate the slope

Now for calculating y we calculate b

Now we calculate y by using the formula

Y=mX+b

Y= (0.454) ( 60) + (22.087)

Y= 27.24+22.087

Y= 49.327

Hence3, the winning percentage against 60 blown calls can be predicted to be 49.327


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