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1) Explain the difference between multiple independent variables and multiple levels of independent variables. Which is better?
2) What is blocking and how does it reduce "noise"? What is a disadvantage of blocking?
3) What is a factor? How can the use of factors benefit a design?
4) Explain main effects and interaction effects.
5) How does a covariate reduce noise?
6) Describe and explain three trade-offs present in experiments.
In what height interval must the company expect to determine middle 70% of kindergarteners?
43 students, 22are sophomores, 28are chemistry majors, and 11are neither. What are the probability that the student is both a sophomore and a chemistry major?
Calculate the value of chi-square. What is your decision regarding H 0 ?
The researcher expects a 12-point treatment effect and plans to use a two-tailed hypothesis test with a = 0.05.
Use this information to construct a probability table, and then calculate each of the following probabilities:
Perform the chi-square test for a uniform distribution. At α = . 01, does this sample contradict the assumption that readership is uniformly distributed?
Set-up/solve the problem graphically. (How many ceiling fans and how many floor fans should be made?)
Find a 90% confidence interval for the difference between the proportion of men and the proportion of women who approved of Reagan's performance. What assumption do you make to use this method?
A local bank reported to the federal government that its 5,246 saving accounts have a mean of $1,000 and standard deviation of $240.
To maximize Andre's probability of landing on the net, how far away from the cannon should he position the nearest edge of the net?
Western residents reported that they were completely satisfied with their local telephone service. Find the 95% confidence interval for the difference in two proportions.
For a sample of 11 independent observations from a normal distribution of unknown μ and unknown variance σ 2 , the sample mean is 74.6 and sample variance is 2.2. What is the lower point of the 90% confidence interval for μ?
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