Of 346 items tested, 12 are found to be defective.Construct a 98% confidence interval for the Percentage of all such items that are defective.
A)(0.13%, 6.80%)
B)(3.34%, 3.59%)
C)(0.93%, 6.00%)
D)(1.85%, 5.09%)
E)(1.18%, 5.76%)

Question

Quizplus · Accepted Answer

The sample proportion of defective items is 12/346. Using the formula for a confidence interval for a proportion and a Z-score for 98% confidence, the interval is calculated as (1.18%, 5.76%).

Of 346 Items Tested, 12 Are Found to Be Defective