Question

In? randomized, double-blind clinical trials of a new? vaccine, infants were randomly divided into two groups. Subjects in group 1 received the new vaccine while subjects in group 2 received a control vaccine. After the first? dose, 102 of 746 subjects in the experimental group? (group 1) experienced vomiting as a side effect. After the first? dose, 66 of 619 of the subjects in the control group? (group 2) experienced vomiting as a side effect. Construct a 95?% confidence interval for the difference between the two population? proportions, p 1 minus p 2. Use x 1 = 102?, n 1 = 746?, x 2 =66?, and n 2 =619.

Answer 1

A 95% confidence interval for the difference between the two population proportions (p₁ - p₂) is, ( -0.0045, 0.0647)

Using TI-84 plus calculator we get above confidence interval.

1) Go to STAT button then go to TESTS

2) Choose B: 2-PropZInterval then put above value of x1, n1, x2, n2 and C-level we get above answer.