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Concept explainers
Median Income The following table gives the median household income, meaning that half the households in the United States earned less than that amount and half the households earned more than that amount (see Chapter 10), for various years. (Data from: US. Census Bureau.)
Year | 2005 | 2010 | 2014 | 2015 |
Household Income | $46,326 | $49,276 | $53657 | $56,516 |
a. Use the data from the years 2005 and 2010 to find a linear model for these data, with a: = 5 corresponding to the year 2005.
b. Find the least-squares regression line for all these data.
c. Use the models in parts (a) and (b) to estimate the median household income for the year 2015 to the nearest dollar. Compare the estimates to the actual value for 2015.
d. Assuming the trend continues, use the model for part (b) to estimate the median household income for the year 2018 to the nearest dollar.
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Chapter 2 Solutions
Mathematics with Applications In the Management, Natural, and Social Sciences (12th Edition)
- math 5arrow_forwardExplain why 4 | 0 but 0 + 4. Your response should make use of the definition of "divides". Keep in mind that "divides" means something different than "divided by".arrow_forward"Solve the following differential equation using the Operator Method and the Determinant Method:" y'''' + 3y'"' + 3y'' + y = xarrow_forward
- practice for exam please helparrow_forwardDecide if the following are true or false: • true 5 = 2 (mod 3) • true 0 = 16 (mod 4) • false 9 = 10 (mod 3) • false -8 = 19 (mod 9).arrow_forwardDecide if each of the following are true or false: ⚫ false 4 | 13 ⚫ true -8 64 . ⚫ true 18 | 9 • ⚫ true 6 | 0 • • true 1 | −1arrow_forward
- math 2arrow_forwardFig. 4.22. Problems 4.1 (A). Determine the second moments of area about the axes XX for the sections shown in Fig. 4.23. [15.69, 7.88, 41.15, 24; all x 10-6 m. All dimensions in mm IAA inn 100 25 50 25 50 80 50 50 Fig. 4.23. X 80 60arrow_forwardے ملزمة احمد Q (a) Let f be a linear map from a space X into a space Y and (X1,X2,...,xn) basis for X, show that fis one-to- one iff (f(x1),f(x2),...,f(x) } linearly independent. (b) Let X= {ao+ax₁+a2x2+...+anxn, a;ER} be a vector space over R, write with prove a hyperspace and a hyperplane of X. مبر خد احمد Q₂ (a) Let M be a subspace of a vector space X, and A= {fex/ f(x)=0, x E M ), show that whether A is convex set or not, affine set or not. Write with prove an application of Hahn-Banach theorem. Show that every singleton set in a normed space X is closed and any finite set in X is closed (14M)arrow_forward
- 4.3 (A). A conveyor beam has the cross-section shown in Fig. 4.24 and it is subjected to a bending moment in the plane YY. Determine the maximum permissible bending moment which can be applied to the beam (a) for bottom flange in tension, and (b) for bottom flange in compression, if the safe stresses for the material in tension and compression are 30 MN/m² and 150 MN/m² respectively. Y [32.3, 84.8 kNm.] 150 100 50 -25 +50-50-50-50- All dimensions in mmarrow_forward"Find the values of V1, V2, and V3 by solving the following differential equation system:" 1 L1 1 X - X x 2 - 2x x2 x3 x² - 4x + 2] M Larrow_forwardmath 1arrow_forward
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