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For each of the fifty states if you look at the state average income and the percentage of people in that state who are foreign-born immigrants, you will see a positive correlation. Does this mean immigrants tend to earn more than other people? Or does it mean immigrants improve a state's economy? If not, what could explain the correlation?
Construct a 95% confidence interval estimate of the population mean life of the light bulbs.
You take a random sample around town and calculate a p-value for your hypothesis test of 0.0913. What is the appropriate conclusion? Conclude at the 5% level of significance.
Compute the standard error of the mean O(funny o with line) line over x, for sample sizes of 50, 100, 15o, and 200. What can you say about the size of the standard error of the mean as the sample size is increased?
What kind of correlation do you expect to find between annual income and amount spent on car? Will it be positive or negative?
An experiment with three outcomes has been repeated 50 times, and it was learned that E1 occured 20 times, E2 occured 13 times, and E3 occured 17 times.
What size sample would be required to estimate the proportion of hospital referrals with a margin of error of 0.04 or less at 95% confidence?
The sampling distribution of the average score and Suppose x' is your average pay for the 100 weeks. Then x' has approximately
A. What is the coefficient of determination? B. What is the correlation coefficient? C. What is the sampl mean of Y?
Identify the population and the sample: A survey of 787 small-business managers found that 72% are optimistic about the future of their company.
A market researcher is interested in knowing the type of training that works best for DVD users. Thirty consumers are randomly selected from a population of known DVD owners (i.e., users).
What factors might cause the company to order a larger or smaller amount than the EOQ?
For each of the 50 states and Washington, D.C., a number of statistics related to education are available for 1992
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