Aparameter is defined as the a. true value of the null hypothesis b. true value of a variable c. estimate of a variable, as determined through a sample d. estimate of the population parameter e. estimated value of a construct

 The answer is (c) estimate of a variable, as determined through a sample.

Step-by-step explanation: We are given four different options out of which one gives the perfect definition of a parameter.

In mathematics, a parameter is defined as a constant  or a variable in a function that determines a particular form of the function but not its general form. For example,  f(x) = k x, where 'k' determines only the gradient of the line described by f(x).  

In statistics, a parameter is defined as a variable that enters in the mathematical form of a distribution such that the possible values of the variable correspond to different distributions.

Thus, the correct option is (c) estimate of a variable, as determined through a sample.

the answers c

n=9

step-by-step explanation:

7 times a number = 7n

decreased by 13 = 7n-13

same as is =

5 times the number = 5n

increased by 5 = 5n+5

7n-13 = 5n+5

2n=18

n=9