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Based off the three requirements that must be met before an analysis of variance test (ANOVA) can be used:
1. Samples must be randomly selected from the populations to be evaluated.
2. All populations from which the samples are selected must have a normal probability distribution.
3. All the populations from which samples are selected must have the same variance.
How might one know if the samples follow a normal distribution?
For each problem, compute a Welch F-statistic and determine whether or not significant differences exist among the treatment conditions.
Describe the factors that might cause variation in weight of Tootsie Rolls during manufacture.
What is the null hypothesis? What is your decision if a = 0.01?
In a nationwide study directed by UMUC Teaching Hospital, 780 persons with stable heart disease were treated. Half of the subjects were treated with drugs and half underwent bypass surgery.
The data consists of random sample of 30 households from the 2007 American Community Survey. Construct a frequency distribution and a histogram for each data set.
What is a probability notation? What are the advantages and disadvantages of using a probability notation? How does probability notation aid in decision making?
Suppose that the incidence of MI is 0.005 per year among subjects who are actually take placebo and that aspirin prevents 20% of MIs
What is the probability that the contaminated can is selected for testing?
Think of a case in which regression analysis was used, but not properly. For instance, discuss situations in which regression analysis is not appropriate and does not add useful information to our understanding of a set of data.
How does the efficiency of a regression predict the power of the t-test? How do robust standard errors change the comparison between hypothesis testing using OLS and robust regression? What does dependence in the e do to the t-test? what does non-no..
The mean television viewing time for Americans is 15 hours per week (Money, November 2003). Assume a sample of 60 Americans is taken to further investigate viewing habits. Suppose the population standard deviation for weekly viewing time is Q = 4..
Which measure of family wealth is most important, when making political decisions, the national mean, median or mode?
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