Immunity. A vaccine manufacturer is testing a type of vaccine on four different age groups that may or may not develop immunity to a particular virus. A sample of 5500 individuals are randomly selected and grouped into different age group categories. The results are recorded in the following table:

a) Is this a survey, a retrospective study, a prospective study, or an experiment? Explain.

b) Is this a test of homogeneity or independence?

c) Do you see evidence of an association between the age groups and the development of immunity?

d) Does this study prove that the vaccine does not help develop immunity against the virus for different age groups? Explain.

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Age Group Develops Immunity Yes No 11-20 984 195 21-30 1738 383 31-40 1178 231 41-50 639 152