Find the indicated margin of error. In a clinical test with 2161 subjects, 1214 showed improvement from the treatment. Find the margin of error for the 95% confidence interval used to estimate the population proportion.

The  margin of error is  

Step-by-step explanation:

From the question we are told that  

   The  population size is  

    The number that showed improvement is  

Generally the sample proportion is mathematically represented as

=>    

Given that the confidence level is  95% then the level of significance is mathematically represented as

=>    

The  critical value of from the normal distribution table is  

Generally the margin of error is mathematically represented as

=>      

=>      

-7

step-by-step explanation:

x^2 + 18x + 74 = (x + 9)^2 - 81 + 74

= (x + 9)^2 - 7.

so q = -7.