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Suppose mean = 70 mph and sd = 10 mph, what can we say about the distribution of the scores in that data set?
a trucking firm delivers appliances for a large retail operation. the packages or crates have a mean weight of 300 lb.
Suppose that an observational study showed that students who got at least 7 hours of sleep performed better on exams than students who got less than 7 hours.
Construct cumulative risk profiles for the three alternatives, assuming Apricot has a 25% chance of winning the lawsuit. Can you draw any conclusions?
For the most recent year available the mean annual cost to attend a private university in the US was $26,889. Assume the distribution of annual costs follows a normal probability distribution and the standard deviation is $4,500. 95% of all studen..
How can bootstrap confidence intervals be generated? Name the simplest form of a bootstrap confidence interval. Are bootstrap confidence intervals exact?
(a) Plot the GDP time series graphically. (b) Calculate the least squares trendline for GDP. (c) Use this equation to predict the country's GDP for 2012 and 2013.
After the campaign, the company surveyed 500 people; 36 were aware of the brand name. What is the p-value of the test?
The details were even more disturbing: "Errors by air traffic controllers climbed from 746 in fiscal 1997 to 878 in fiscal 1998, an 18% increase." So, are the risks of a fatal airline crash or an air traffic control error something that should be ..
Find the mean and standard deviation for the MTBE levels of the sampled wells and construct the interval y¯ ± 2s. Estimate the percentage of wells with MTBE.
For each of the following examples, explain whether the researcher has made a correct decision or has made a Type 1 or Type 2 error. Explain why.
An investigator has prepared a drug dosage level that he says will induce sleep in 80% of people with insomnia. After examining the dose, we think that what
Suppose two teams play a series of games, each producing a winner and a loser, until one team has won two more games than the other.
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