IQ levels: A study investigated whether there are differences between the mean IQ level of people who were reared by their biological parents and those who were reared by someone else. What is the null hypothesis in this case? Group of answer choices a. The mean IQ level of people who were reared by their biological parents is higher than the mean of those who were not. b. The mean IQ level of people who were reared by their biological parents is lower than the mean of those who were not. c. There is no difference between the mean IQ levels of people who were reared by their natural parents and those who were not. d. There is a difference between the mean IQ levels of people who were reared by their natural parents and those who were not.

C. There is no difference between the mean IQ levels of people who were reared by their natural parents and those who were not.

Step-by-step explanation:

In a statistical test, the hypothesis that there is no significant difference between specified populations, any observed difference being due to sampling or experimental error is called null hypothesis.

c.There is no difference between the mean IQ levels of people who were reared by their natural parents and those who were not.

Step-by-step explanation:

There is no difference between the mean IQ levels of people who were reared by their natural parents and those who were not.

see attached

step-by-step explanation:

given the function as;

write the equation replacing f(x) with y

form   and fill a table containing values of y with corresponding values of x

you can take a range for   values of x as -3≤x≤3

solving for x=-3

for x=-2

repeat the same procedure to get the values of y for the remaining ,x=-1 to x=3

plot the values of y against values   of x and obtain the following graph