A company produces and tests a new mineral supplement designed to prevent the common cold. The company tests three dosages of the mineral supplement on 300 participants, male am female, between the ages of 25 and 50 over a 6 month period Each group has 100 randomly assigned participants. The table shows the dosages of the mineral supplement given to each
participant in each group and the numbers of participants that report having the common cold during the 6-month period
Mineral Supplement Study
Number of Common
Group
Dosage
Cold Cases
1
50 mg/day
10
2
100 mg/day
6
3
150 mg/day
5
The company claims that the mineral supplement can effectively prevent the common cold. A scientist disputes the claim, saying an error exists in the setup of the groups for the
investigation