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A New York Times survey of 400 executives found that 248 of the executives stated that the U.S. legal system significantly hampers the ability of U.S. companies to compete with foreign companies. Compute and explain a 90% confidence interval for the population proportion of executives who believe the U.S. legal system hampers the ability to compete.
The ages of cars owned by all employees of a large company have a bell shaped distribution with a mean of 8 years and a standard deviation of 2 years. Using the empirical rule, find the approx. percentage of cars (owned by those employees) that are b..
A manufacturer of a chemical used in glue, attempting to control the amount of a hazardous chemical its workers are exposed to, has given instructions to halt production if the mean amount in the air exceeds 3.0 ppm.
Assuming this is literally true, how can it be explained? What facts / statistics would you need to know to expose this misleading claim?
The data consists of random sample of 30 households from the 2007 American Community Survey. Construct a frequency distribution and a histogram for each data set.
The purchase of a coin-operated laundry is being considered by a potential entrepreneur. The present owner claims that over the past 5 years the average daily revenue has been $675 with a standard deviation of $75.
Create a scatterlpot of P_RFM and P_HELM. If drawing plot by hand, use graph paper to make sure accuracy. Be sure you label axes. After you have created the scatterplot, consider its form and direction. Recognize outliers, if any.
If alpha level is changed from a = 0.05 to a = 0.01. What occurs to boundaries for critical region?
Develop a model that determines your round-trip gasoline cost. What assumption or approximations are necessary to treat this model as deterministic model?
The population mean height of a basketball player is 220 cm with a standard deviation of 20 cm. In a sample of 49 basketball players, what is the probability of getting a sample mean height of 215 cm or more?
Find the optimal order quantity and what is the optimal total ordering cost per year vs. what is that cost with the current policy?
When an experiment is conducted, one variable is manipulated to see the impact on another variable -- that's why experiments address causation.
If represents the true average gas mileage for this new model, which of the following gives the null and alternative hypothesis that the CONSUMER group should test?
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