Which of the following conditions must be met in order to make a statistical inference about a population based on a sample it the sample does not come from a normally distributed population?
ON230
1230
1230
ON230

What are the coordinates of the hole in the graph of the function f(x) ? f(x)=x2−9x−3 enter your answer in the boxes.

Astudent simplified a rational expression as shown.

Researchers were interested in whether relaxation training decreases the number of headaches a person experiences. they randomly assigned 20 participants to a control group or a relaxation training group and noted the change in number of headaches each group reported from the week before training to the week after training. which statistical analysis should be performed to answer the researchers' question?