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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.
Does the confidence interval make us 95 percent confident that the population mean perceived age estimate is at least 25? Is the mean perceived age estimate much more than 25? Explain.
The population proportion of customers under age 21 is 0.68.
The same monitoring of radio-collared lions over the years suggests that the overall proportion of stalks that are the crouching type is about 0.87. Do the data above provide evidence that for this population of lions the proportion of crouching stal..
Find out about your company's forecasting system
An astronomer at the Mount Palomar Observatory notes that during the Geminid meteor shower, an average (?) of 50 meteors appears each hour, with a variance (σ2) of 9. The Geminid meteor shower will occur next week.
What percentage of the area of the standard normal distribution is between z = -2.00 and z = +2.00? How do you know this?
Suppose that the New England Colonials baseball team is equally likely to win any particular game as not to win it. Suppose also that we choose a random sample of Colonials games.
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Examine the skewness and kurtosis values for each dependent variable, examining the histograms and examine the Shapiro-Wilks' results and What is the outcome of the multivariate tests
A foreign language course and a psychology course?
question 1 the manager of a cosmetics company was interested in new zealanders personal hygiene. a survey was conducted
A New York restaurant would like to estimate the average amount customers spend for dinner. A sample of size 49 customers resulted an average of $32.60. Assume the population standard deviation is $5.a. What is the point estimation for the mean of th..
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