The group of students had a test on Statistics. The following student’s blood pressure results are given in the table before and after the test:  Student 1 2 3 4 5 6 7 8 before 70 74 73 80 74 85 81 75 after 72 78 75 79 84 88 82 78 Do the data support that the blood pressure is changed at the α=0.05? The difference is believed to be approximately normally distributed.

A First Course in Probability (10th Edition)
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Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
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The group of students had a test on Statistics. The following student’s blood pressure results are given in the table before and after the test: 

Student

1

2

3

4

5

6

7

8

before

70

74

73

80

74

85

81

75

after

72

78

75

79

84

88

82

78

Do the data support that the blood pressure is changed at the α=0.05? The difference is believed to be approximately normally distributed. 

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