data below shows the scores a sample of husbands and their wives received when given a happiness test to determine their 'happiness' in the relationship.  H 50 65 72 18 45 98 77 85 50 82 W 60 55 60 25 80 80 70 80 70 50 For the regression line y = a + b

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The data below shows the scores a sample of husbands and their wives received when given a happiness test to determine their 'happiness' in the relationship. 

H

50

65

72

18

45

98

77

85

50

82

W

60

55

60

25

80

80

70

80

70

50

For the regression line y = a + bx, what is the value of b? (to 4 decimal places)

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