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A teacher believes that whatever he says in class has no effect on his students. Just as he's about to quit his profession, a statistician enters the room and suggests that the teacher design a study to test his assumption. The study will look at whether providing in-class feedback on homework assignments enhances classroom performance.
The teacher wants to know whether providing feedback before or after returning the assignments is most useful. He's also interested in the most effective means of presenting the feedback: verbal presentation, written handout, or a summary on overheads. Ultimately he'd like to identify the best approach for increasing test scores of the students. There are 12 classes available in the school for the experiment.
Design an experiment that helps answer these questions. Identify the factors, the levels of the factors, the treatment groups, and the response variable. How will the students be assigned to the different treatment groups? Is it possible to use simple random assignment of all students?
Use diagrams to summarize the experimental design.
Read "In the Matter of BJ's Wholesale Club, Inc., FTC File No. 042 3160, June 16, 2005, Agreement Containing Consent Order" at www.ftc.gov/opa/2005/06/bjswholesale.htm.
Should it be a z-test, a t-test, or an ANOVA for the analysis? Please help. What would the choice of test depend on? Would the hypothesis be directional or non-directional? Would the test be one-tailed or two-tailed? What would be the null and wha..
professor fair believes extra time does not improve grades on exams. he randomly divided a group of 300 students into
A computer statistical package has included the following quantities in its output:
The Manager of a seafood restaurant was asked to establish a pricing policy on lobster dinners. Experimenting with prices produced the following data:
The inside diameter of a randomly selected piston ring is a random variable with mean value 12 cm and standard deviation 0.02 cm.
suppose that you want to test for a difference in proportion between two groups. group 1 has 80 respondents and 40 of
When the green Baboon line runs along the horizontal axis. When the green and black lines intersect. Just after the sharp peak of the green line.
What is a communication plan? What are the different forms and how can you use this for an organization involving changing their management?
Based on your results, do you believe recharging an air conditioner really results in more refrigerant in the system? Why or why not?
Out of n individual voters at an election, r vote Republican and n -r vote Democrat. At the next election the probability of a Republican switching.
Randomly selected nonfatal occupational injuries and illnesses are categorized, according to the day of the week that they first occured, and the results are listed below.
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