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1. When is it appropriate to use stratified random sampling? What are strata, and how should strata be selected?
2. When is cluster sampling used? Why do we describe this type of sampling by using the term cluster?
3. Explain how to take a systematic sample of 100 companies from the 1,853 companies that are members of an industry trade association.
4. Explain how a stratified random sample is selected. Discuss how you might define the strata to survey student opinion on a proposal to charge all students a $100 fee for a new university-run bus system that will provide transportation between off-campus apartments and campus locations.
5. Marketing researchers often use city blocks as clusters in cluster sampling. Using this fact, explain how a market researcher might use multistage cluster sampling to select a sample of consumers from all cities having a population of more than 10,000 in a large state having many such cities.
The specifications of the clearance between the mating parts are 0.5 ± 0.4. What fraction of assemblies will fail to meet specifications if assembly is at random?
Test the claim that with garlic treatment, the mean change in LDL cholesterol is greater than 0. What do the results suggest about the effectiveness of the garlic treatment?
Describe the assumptions of normality and homogeneity of variance. When these assumptions are violated, what are your options? Are there cases in which the assumptions may technically be violated, yet have no impact on your intended analyses? Explain
5. A laboratory weights filters from a coal mine to measure the amount of dust in the mine atmosphere. Repeated measurements of the weight of dust on the same filter has a standard deviation of σ = 0.08 milligram (mg) and mean 123 mg.
Why does Course Hero state $14.95 for one month then when I try and sign up it states a min of 3 months at $19.95?
What is the difference between a bernoulli distribution and a poisson distribution? How can they be applied to a standardized normal distribution, specifically when looking at a histogram?
The degree of flatness or peakedness of a population
What is this maximin value
Do the independent variables correlate statistically significantly and practicallywith the dependent variable and is collinearity between the independent variables a concern?
a)Complete the ANOVA table. b) What is the multiple standard error of the estimate?c) What is R2?
1. The J.O. Supplies Company buys calculators from a Korean supplier. The probability of a defective calculator is 20%. If 14 calculators are selected at random, what is the probability that less than 3 of the calculators will be defective?
The C.S. Mott Children's Hospital surveyed a national random sample of parents about their desire for email consultation for their child's minor illness or injury and their willingness to pay for this convenience.
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