Where Millionaires Live in America. In a 2018 study, Phoenix Marketing International identified Bridgeport, Connecticut; San Jose, California; Washington, D.C.; and Lexington Park, Maryland as the four U.S. cities with the highest percentage of millionaires (Kiplinger website, https://www.kiplinger.com/slideshow/investing/T064-S001-where-millionaires -live-in-america-2018/index.html). The following data show the following number of millionaires for samples of individuals from each of the four cities.                             Bridgeport San Jose Washington Lexington Park, City Millionaire          CT           CA           D.C.                 MD Yes                           44              35           35                    34 No                           356            350         364                  366 a. What is the estimate of the percentage of millionaires in each of these cities? b. Using a .05 level of significance, test for the equality of the population proportion of millionaires for these four cities. What is the p-value and what is your conclusion?

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Matrices

‘Matrices’ is the plural form of the word matrix, and it is basically a spreadsheet in the form of a box. In mathematics, various functions can be carried out with matrices. Generally, a matrix comes in the shape of a square or rectangle. The elements are distributed horizontally in the form of rows, and vertically in the form of columns.