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Problem 2


13.6 Testing Categorical Probabilities: Two-Way (Contingency) Table

Use the table below, which is from a study on vitamin C intake and the common cold, to test if vitamin C intake and colds are independent.
Status                                     Vitamin C Group                   Placebo Group                 Total
Children free of colds                        21                                         11                               32
Children developing colds               36                                         35                               71
Total                                                      57                                         46                              103


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