6. A clinical trial was conducted to determinc if a certain type of inoculation has an cffect on the incidence of a certain discase. A sample of 500 of the rats were given the inoculation and 500 of them not inoculated. In the group not inoculated, there were 120 incidences of the discase, while 98 of the rats in the inoculated group contracted it. Compute a 99% confidence interval for the difference between the proportions of inoculated and not inoculated groups.

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