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68 66 62 72 70 60 77 71 67 70 80 60 71 71 71 64 73 78 76 75 69 75 1-Calculate the confidence

68 66 62 72
70 60 77 71
67 70 80 60
71 71 71 64
73 78 76
75 69 75

1-Calculate the confidence level for this case

2-Choose the value of calculated t.

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