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A nation-wide (U.S.) donut chain determined that its stores sells an average of 256 donuts per day with a standard deviation of 36 donuts. If a sample of 16 stores results in a sample average of 249 donuts what is the standard error of the mean?
Find the sample proportions and test statistic for equal proportions. Is the decision close? Find the p-value.
Explain in your own words how to recognize a situation where you needed to use a two-sample test. Give a unique example of a two sample test for proportion or mean. Make sure to detail why only a two sample test would suffice.
A study concluded that waist to hip ratios are a better predictor of 5-year survival than more traditional height-to-weight ratios.
The Niko electronics company just manufactured 5000 CDs, and 3% are defective. If 10 of these CDs are randomly selectedd for testing, what is the proability tha the entire batch is will be rejected.
Determine the least squares equation. On the basis of this information, what are the estimated sales for 2005?
In the boom years of the late 1990s, it was often said that rapidly increasing stock prices were responsible for much of the rapid growth of real GDP. Explain how this could be true, using aggregate demand and aggregate supply analysis
Estimate with 90% confidence the difference in the level of satisfaction with service between the two branches.
Historical data suggests a standard deviation in the first sample of 10 and a standard deviation in the second sample of 16. Find a 95% confidence interval for the population difference.
Roger has read a report that the weights of adult mail Siberian tigers have a distribution which is approximately normal with mean μ = 390 lb and σ = 65 lb
Biologists suspect that male wolves are more likely than females to return to an area where the population has been greatly reduced.
Thirty percent of the population in a southwestern community are Spanish-speaking Americans. A Spanish-speaking person is accused of killing a non-Spanish speaking American.
Questions based on binomial distribution, variance of the binomial distribution, discrete random variable and continuous random variables.
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