In a recent poll of 1200 randomly selected adult office workers, 32% said they had worn a halloween costume to the office at least once. report the 95% confidence interval for the proportion of all adult office workers who have worn a halloween costume to the office at least once. (round final calculations to the nearest tenth of a percent)

Step-by-step explanation:

The confidence interval for population proportion is given by :-

, where = sample proportion.

z* = critical value (Two-tailed)

n= Sample size ;

In the given problem , we are given

n= 1200

Also, we know that the critical value for 95 %confidence interval : z*= 1.96

Now, the 95% confidence interval for the proportion of all adult office workers who have worn a Halloween costume to the office at least once will be :-

Hence, the required confidence interval =