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A high school administrator wants to determine whether positive reinforcement improves student performance. A group of students is randomly selected from the high school population. Their last year's records are examined for their GPAs. Beginning the first day of the school year and continuing through the first semester, the selected students receive a reward (free movie tickets) whenever they pass a major test. At the end of the first semester, their GPAs for the semester are calculated and compared to the last year's GPAs.
(a)Comment on this design. Identify biases, concerns, and why you might question any results.
(b)Suggest an improved design. Be sure to specify your design completely; include a diagram if appropriate; discuss how you would implement your study.
The mean annual income of certified welders is normally distributed with a mean of $50,000 and a population standard deviation of $2,000. The ship building association wishes to find out whether their welders earn more or less than $50,000 annually. ..
The marketing team from Mi Casa Front Porch Restaurant is looking to promote the restaurant on the internet. They want to provide a realistic view of ranges for average bill for a party of 2 for lunch and dinner. They have gathered the following data..
Find the area under the normal distribution curve between z = -0.05 and z = 2.85.
For the daily lottery game in Illinois, participants select three numbers between 0 and 9. A number cannot be selected more than once, so a winning ticket could be, say, 307 but not 337. Purchasing one ticket allows you to select one set of num..
Define each of the following: Type I error, and Type II error. When testing a hypothesis, why don't we set the probability of a Type I error to be extremely small? Explain.
The United States has ten times the population of Canada. Assuming equal standard deviations, how many American teenagers must be sampled in order to estimate the true mean amount of time American teenagers spend on the internet per day to within 15..
Match the linear correlation coefficient to the scatter diagram.
Would like to know what factors influence the annual income of a person. What are some of the variables you will look for? How would you collect data on these variables? Is the data qualitative or quantitative? Remember that for each person you find ..
Does there appear to be a relationship between work hours and loan amount - Explain the meaning of the coefficient of determination as it applies specifically to this problem.
What is the probability of rolling a four in the gambling dice game of craps and What is the probability that a player can roll a four 3 times in a row - In a pilot study evaluating the use of a new drug to lower resting heart rates (HR) of patient..
Consider an experiment that consists of 2 rolls of a balanced die. If X is the number of 4s and Y is the number of os obtained in the 2 rolls of the die, find (a) the joint probability distribution of A and V; (b) P[(X, Y) € A], where A is the region..
Using graphical, numerical summary and interpretation
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