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1. Under what situations a treatment effect can be very large, and in some situations it can be very small. Suppose a sample of n = 16 individuals is chosen from population with mean of µ = 70. Treatment is handelled to sample and, after treatment, sample mean is found to be M = 76. Notice that treatment appears to have increased scores by average of 6 points.
a) If population standard deviation is σ = 20 is effect large adequate to be statistically significant? Use two - tailed test with α = .05b) If population standard deviation is σ = 8 is effect large adequate to be statistically significant? Use two - tailed effect with α = .05
NCAA Basketball Tournament. Each year, 64 college basketball teams compete in the NCAA tournament. Sandbox.com recently offered a prize of $10 million to anyone who could correctly pick the winner in each of the tournament games.
The appropriate use of multiple regression depends on being able to make four basic assumptions about the data being used to develop the regression model:
where the deviations εi are assumed to be independent and Normally distributed with mean 0 and standard deviation σ. This model was fit to the data using the method of least squares. The following results were obtained from statistical software.
A random sample of 100 computers showed a mean of 115 gigabytes used with a standard deviation of 20 gigabytes. What is the standard error of the mean?
Which approach is most preferred and why? Optimistic, conservative, or minimax regret. Also, is establishing the most appropriate approach before analysising the problem important for the decision maker?
Based on this information, by what factor does the risk of having an accident increase due to driving while intoxicated?
What proportion of time will it take clean-up crew 56 or more hours for cleaning plant? Define the lower and upper limits of interval.
What is the probability that at least three students choose Supreme Chocolate?
Use Excel and determine the number of each type of person that will be needed to complete the job within the allotted time and at minimum cost.
The participants in a television quiz show are picked from a large pool of applicants with approximately equal numbers of men and women.
Use analysis of variance to test any differences in mean glue strengths.
How many commercials' worth of data do I need to have a margin of error no more than 3, the correct set of hypotheses
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