Which of the following accurately describes the chi-square test for goodness of fit? a. It is similar to a correlation because it uses one sample to evaluate the relationship between two variables. b. It is similar to both a correlation and an independent-measures t test because it can be used to evaluate a relationship between variables or a difference between populations. c. It is similar to an independent-measures t test because it uses separate samples to evaluate the difference between separate populations. d. It is similar to a single-sample t test because it uses one sample to test a hypothesis about one population.

the answer is b.

step-by-step explanation:

by the trigonometric ratio tangent, tangent equals opposite divided by adjacent.

therefore, tan(50) equals ac/3

multiply each side by 3 to get: ac=3tan(50)

the answer is b.

x= -3 and

step-by-step explanation:

to find the roots of a cubic, use division or factoring to find the factors then set equal to 0. as this is a difference of cubes, it factors into

where a is the cube root of .

here   this is 27 and the cube root of 27 is 3. so we write using the form:

.

set each factor to 0 and solve for x.

x-3=0

x=3

the quadratic expression does not factor and must be solved using the quadratic formula.

where a = 1, b=3, and c=9

this cubic has two complex roots.

x=half

step-by-step explanation:

the answer would be c:   ax + b = ax + c

step-by-step explanation: