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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.
For the daily lottery game in a particular state, participants select 4 numbers between 0 and 9. A number cannot be selected more than once, so a winning ticket could be 3071 but not 3371. THe order of selection is important. Purchasing one ticket al..
A random variable X has E(X)=3 and V(X)=7. Define a new random variable: Y=6X + 3. What is E(Y) and V(Y)?
Hematologic data for patients with aplastic anemia
The following are annual rate of return for US government T-bills and UK common stocks:
Calculate the mean, median, and standard deviation and get statistics on the original reaction time, separately for the three stimulus types. Comment on how the means compare for the three stimulus types.
The diameter of a mechanical cylinder is 3 inches but can be as large as 3.03 inches and as small as 2.97 inches. If the process has a grand mean of 3.01 inches and a standard deviation of.02 inches. What is the probability of producing bad cylinde..
A random sample of [n=64 children] of working mothers showed that they were absent from school a sample average of [x=5.3] days per term, with a standard deviation [s=1.8 days]. Provide a 96% confidence interval for the average number of days absent..
In a lottery game, you pick one number from 000 to 999. If you pick one such number what is the probability that you will win the lottery?
What steps would you take to set up an analytical analysis?
question 1 a package delivery service claims that no more than 5 percent of all packages arrive at the address late.
Use Analyze, Descriptive statistics, Frequencies to summarize nonmetric variables, and create a pie-chart for Year in college and create a histogram for IQ and include the normal distribution.
What is the decision rule?
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