An educational researcher wants to evaluate the effectiveness of a new method for teaching reading to deaf students. Achievement at the end of a period of teaching is measured by a student's score on a reading test. (Assume reading scores are integers.)
(a) What is the variable to be measured?
I number of teachers
II days in a teaching period
III number of students
IV teaching method
V reading score
What type of variable is it?
I discrete
II continuous
(b) What is the experimental unit?
I reading score
II teaching period
III student
IV teaching method
V teacher
(c) Identify the population of interest to the experimenter.
I the total number of days in the school year
II all students
III the reading scores of al students who could possibly be taught using this method 21 17

Acaterer knows he will need 60, 50, 80, 40 and 50 dinner napkins on five successive evenings. he can purchase new napkins initially at 25 cents each, after which he can have dirty napkins laundered by a fast one-day laundry service (i. e., dirty napkins given at the end of the day will be ready for use the following day) at 15 cents each, or by a slow two-day service at 8 cents each or both. the caterer wants to know how many napkins he should purchase initially and how many dirty napkins should be laundered by fast and slow service on each of the days in order to minimize his total costs. formulate the caterer’s problem as a linear program as follows (you must state any assumptions you make): a. define all variables clearly. how many are there? b. write out the constraints that must be satisfied, briefly explaining each. (do not simplify.) write out the objective function to be minimized. (do not simplify.)