The median is a measure of central tendency. The mean is calculated by adding up all of the numbers and multiplying it by the total.

If you are studying a variable that has an ordinal level of measurement, which of the following statistical tests should be used to determine if there is a statistically significant difference between the variables of interest?

In a study on the effects of an oral mouth rinse on gingivitis, some patients start using a new gingivitis toothpaste too. What threat to validity is this?

Which of the following is an adequate directional alternate hypothesis? 

For the following MATLAB program, what is the output result?      n = 200;   A = zeros(n,n);   for k = 1:n      for j = k:n         A(k,j) = 1-3*(k+j);         A(j,k) = -A(k,j);      end   end     A(149,1)  

For an online exam, a working webcam is required and it’s important to place your webcam in the right position, so your exam is valid. A scan of your entire desk, keyboard, and monitor is required (a room scan is not required). Sit directly in front of your webcam Adjust your camera so that your head is on the top half of the profile view when you are looking at your monitor (It’s okay when you look down and work on the questions)       Perform a scan to show your entire desk, keyboard, and monitor NOW If you are using a laptop with an internal webcam (laptop), use a mirror or phone camera to perform a scan. Put your phone away and do not leave it on your desk after the scan.  If you are using an external webcam, move your camera to perform a scan. Avoid strong back-lighting Check your Honorlock recording screen. Do you place your camera in the right position and do you perform the required scan?

Exam format: Typically, there are 10 multiple-choice questions plus one 1 extra credit question (multiple-answer) on the test.  One or two Matlab-related questions will be tested. At the end of the actual exam, you will see the following questions. You should answer the last two questions only when you are ready to submit your exam. Be sure to watch the timer!  Canvas submits your test automatically when the time is up, and you need to make sure that you have enough time to answer the last two questions and perform the required procedure. If you run out of time for the last two questions, be sure to report them (the link can be found on the exam review page) immediately after the exam. 

If the scale factor of Figure A to Figure B is 3 : 8, find the value of x.  Show all supporting work.

Show all supporting work. 

Which of the following are advantages of a PERT chart over a Gantt chart?