After years of rapid growth, illegal immigration into the United States has decl
ID: 3050269 • Letter: A
Question
After years of rapid growth, illegal immigration into the United States has declined, perhaps owing to the recession and increased border enforcement by the United States (Los Angeles Times, September 1, 2010). While its share has declined, California still accounts for 25% of the nation’s estimated 14.2 million undocumented immigrants. Use Table 1. a. In a sample of 60 illegal immigrants, what is the probability that more than 22% live in California? (Round “z” value to 2 decimal places, and final answer to 4 decimal places.) Probability b. In a sample of 190 illegal immigrants, what is the probability that more than 22% live in California? (Round “z” value to 2 decimal places, and final answer to 4 decimal places.) Probability
Explanation / Answer
a)
probability that more than 22% live in California:
b)
for normal distribution z score =(p-p)/p here population proportion= p= 0.250 sample size =n= 60 std error of proportion=p=(p*(1-p)/n)= 0.0559