Completed 4 out of 20 01 21 -- Submit All HR MIN SEC 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 98 apartment records from Staten Island, obtained from a large collection of @ Macmillan Learning income- and expense-filing statements. The 95% confidence interval of rent-controlled apartment costs in Staten Island was $888.00 + $11.72. The cost of all rent-controlled apartments in Staten Island has a standard deviation of $59.20. State the conclusion of the z-confidence interval for the mean. Researchers are certain that the interval ($876.28, $899.72) contains the mean monthly rental cost of