Question

Researchers conducted a study to determine the monthly rental cost of rent-controlled apartments in the five boroughs of New York City in 2012. The study randomly sampled 157 apartment records from the Bronx, obtained from a large collection of income- and expense-filing statements. The 95% confidence interval of rent-controlled apartment costs in the Bronx was $917.00 ± $22.10. The cost of all rent-controlled apartments in the Bronx has a standard deviation of $73.70. State the conclusion of the z-confidence interval for the mean. Researchers are certain that the interval ($894.90, $939.10) contains the mean.

Answer 1

Question Completion:

Researchers are ________certain that the interval ($876.28, $899.72) contains the mean monthly rental cost of _____. (

all rent-controlled apartments in New York City.

all rent-controlled apartments in Bronx.

the 157 apartments in the sample.

all apartments in Bronx)

Answer:

Researchers are ___95%_____certain that the interval ($876.28, $899.72) contains the mean monthly rental cost of _____.

all rent-controlled apartments in Bronx.

Explanation:

The 157 samples were from the Bronx, "obtained from a large collection of income- and expense-filing statements."  The concentration of the study was on "rent-controlled apartments in the Bronx."  So, the study or research is specific.  Therefore, the generalization from its findings can only be specific to the Bronx borough of New York City and affecting only rent-controlled apartments.