85. If a test that has reliability is lengthened by a factor , the reliability of the new test is given by r R the reliability is = 0.5, the equation becomes . When the test length is unchanged, the reliability = r r R(1) ​ = 0.5. If the length of the test is doubled, the reliability = What percent improvement is there in the r R(2). reliability when the test length is doubled? 86. If 140 feet of fence is to be used to fence in a rectangular yard, then the resulting area of the fenced yard is given by where is the width of the rectangle. Is a function of A = x(70-x), x A x? 87. If a box with a square cross section is to be sent by a delivery service, there are restrictions on its size such that its volume is given by the function , where is the length of each side of the cross section (in inches). What x restrictions must be placed on (the domain) so that the volume makes physical sense? x
​ 85. If a test that has reliability r is lengthened by a factor , the reliability R of the new test is given by the reliability is r = 0.5, the equation becomes . When the test length is unchanged, the reliability r = R(1) = 0.5. If the length of the test is doubled, the reliability r = R(2). What percent improvement is there in the reliability when the test length is doubled? 86. If 140 feet of fence is to be used to fence in a rectangular yard, then the resulting area of the fenced yard is given by A = x(70-x), where x is the width of the rectangle. Is A a function of x? 87. If a box with a square cross section is to be sent by a delivery service, there are restrictions on its size such that its volume is given by the function , where x is the length of each side of the cross section (in inches). What restrictions must be placed on x (the domain) so that the volume makes physical sense?
Test-Bank-for-Mathematical-Applications-for-the-Management-Life-and-Social-Sciences-11th-Edition-by-Harshbarger.docx