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Suppose Mary scores 82 on a test, while her class had a mean of 72 and a standard deviation of 5.
Paris Arline's wants to estimate the average number of flights pet year for its crews. A quick pilot study found the mean to be 150 flights, with a standard deviation of 14.
If the die is rolled 25 times, what is the probability that an odd number occurs exactly 14 times? b) What is the expected value of a single roll of the die?
Test at the 1% level of significance whether this data supports the contention that the true average yield for this kind of wheat is less than 2.0 tons per acre.
In 1990, the mean ph. level of rain in town was 4.61. A biologist fears the ph. level has recently increased. She draws a sample of 13 rain dates and obtains this data:
The probability that an American CEO can transact business in a foreign language is 20%. Ten American CEO s are chosen at random. WHat is the probability that at least two, but no more than five can
Determine the critical values. Will the researcher reject the null hypothesis? Explain why for the classical method
The bailey agency is studying long distance calls made from there office. They find that the length of calls follows a normal distribution, with a mean of 4.2 minutes and a standard deviation of 0.
In a 2010 survey, 58% of Generation Y (GenY) adults were found to pay their monthly bills on time. Suppose a member of GenY is randomly selected. What is the probability that this individual pays mo
A new extended lightbulb has an average service life of 750 hours. With a standard deviation of 50 hours. If the service life of these bulbs approximates a normal distributions, about which percent
The weekly mean income of a group of executives is $1000 and the standard deviation of this group is $100. The distribution is normal. What percent of the executives have an income between $1000 and
From the data bank, select a random sample of 30 individuals. Use the z test to test the hypothesis for IQ that u= 100. Use a = .05.
The probability that an American CEO can transact business in a foreign language is 20%. 10 American CEOs are chosen at random. What is the probability that at least two, but no more than five can tra
You are the VP for the cardiovascular service line at a hospital. A nurse manager on the step-down-unit tells you about a study she just read that she thinks could benefit her floor.
An article in a medical journal found that percutaneous nephrolithotomy (PN) had a success rate in removing kidney stones of 289 out of 350 patients. The traditional method was 78% effective. Is the
Find a 90% confidence interval for the difference between true average proportional stress limits for the Red oak and that for the Douglas fir. Interpret your result.
Find a 95% confidence interval for the mean concentration level in mg/ml for the active ingredient found in this product.
The Indiana Department of Transportation wishes to survey state residents to determine what proportion of the population would like to increase the statewide highway speed limit to 75 mph from 65 mp
The Indiana State Police wish to estimate the average mph being traveled on the Interstate Highways, which cross the state. If the estimate is to be within ±5 mph of the true mean with 95% co
A study is to be conducted on the proportion of homeowners who own at least two TV sets. How large a sample is required if we wish to be 90% confident that the error in estimating this quantity is w
The brightness of a television picture tube can be evaluated by measuring the amount of current required to achieve a particular brightness. A sample of 10 tubes results in an Xbar=317.2 microamps w
Complete a Pareto Chart using the following data. Include the chart (graph) and the data table and data information with Defect, Quantity, Running Quantity, Individual Percentage, and Running Percen
Suppose the lifetime of a particular appliance follows an exponential distribution with a mean of 10 years. What is the probability that the appliance will fail in less than 5 years?
What are some of the pitfalls when using regression equations in forecasting the future? Be specific.
Give three examples where descriptive statistics are misleading. What should be done about this problem?