Given: a rhombus is a quadrilateral with 4 congruent sides. prove: if quadrilateral abcd does not have 4 congruent sides, then it is not a rhombus. determine the first step to prove this statement using proof by contradiction. a. assume abcd does not have 4 congruent sides and is a rhombus. b. assume abcd has 4 congruent sides and is not a rhombus. c. assume abcd has 4 congruent sides and is a rhombus. d. assume abcd is not a rhombus.

A. find the power of the test, when the null hypothesis assumes a population mean of mu = 450, with a population standard deviation of 156, the sample size is 5 and the true mean is 638.47 with confidence intervals of 95 b. find the power of the test, when the null hypothesis assumes a population mean of mu = 644, with a population standard deviation of 174, the sample size is 3 and the true mean is 744.04 with confidence intervals of 95% c. find the power of the test, when the null hypothesis assumes a population mean of mu = 510, with a population standard deviation of 126, the sample size is 10 and the true mean is 529.44 with confidence intervals of 95