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{"ops":[{"insert":"The nutritionist and medical doctors have always believed that Vitamin C is highly "},{"insert":"\n"},{"insert":""},{"insert":"\n"},{"insert":"effective in reducing the incidents of colds. To test this belief, a random sample of 13 "},{"insert":"\n"},{"insert":""},{"insert":"\n"},{"insert":"persons is selected and they are given daily doses of Vitamin C under medical supervision "},{"insert":"\n"},{"insert":""},{"insert":"\n"},{"insert":"over a one-year period. The number of codes each person catches during the year is "},{"insert":"\n"},{"insert":""},{"insert":"\n"},{"insert":"recorded and a comparison is made with the number of colds contracted by each such "},{"insert":"\n"},{"insert":""},{"insert":"\n"},{"insert":"person during the previous year. This comparison is tabulated as follows, along with the "},{"insert":"\n"},{"insert":""},{"insert":"\n"},{"insert":"sign of the change."},{"insert":"\n"},{"insert":""},{"insert":"\n"},{"insert":"Observation 1 2 3 4 5 6 7 8 9 10 11 12 13"},{"insert":"\n"},{"insert":""},{"insert":"\n"},{"insert":""},{"insert":"\n"},{"insert":"Without "},{"insert":"\n"},{"insert":""},{"insert":"\n"},{"insert":"Vitamin C"},{"insert":"\n"},{"insert":""},{"insert":"\n"},{"insert":"7 5 2 3 8 2 4 4 3 7 6 2 10"},{"insert":"\n"},{"insert":""},{"insert":"\n"},{"insert":"With "},{"insert":"\n"},{"insert":""},{"insert":"\n"},{"insert":"Vitamin C"},{"insert":"\n"},{"insert":""},{"insert":"\n"},{"insert":"2 1 0 1 3 2 3 5 1 4 4 3 4"},{"insert":"\n"},{"insert":""},{"insert":"\n"},{"insert":"Use the sign test at 0.05 level of significance, determine if Vitamin C is effective in reducing "},{"insert":"\n"},{"insert":""},{"insert":"\n"},{"insert":"colds."},{"insert":"\n"}]}

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