Answer to Question #342282 in Statistics and Probability for Neha

Question #342282

The nutritionist and medical doctors have always believed that Vitamin C is highly


effective in reducing the incidents of colds. To test this belief, a random sample of 13


persons is selected and they are given daily doses of Vitamin C under medical supervision


over a one-year period. The number of codes each person catches during the year is


recorded and a comparison is made with the number of colds contracted by each such


person during the previous year. This comparison is tabulated as follows, along with the


sign of the change.


Observation 1 2 3 4 5 6 7 8 9 10 11 12 13



Without


Vitamin C


7 5 2 3 8 2 4 4 3 7 6 2 10


With


Vitamin C


2 1 0 1 3 2 3 5 1 4 4 3 4


Use the sign test at 0.05 level of significance, determine if Vitamin C is effective in reducing


colds.

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