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Show sufficient evidence that the private university loan default rate is beloww the rate for all universities, using a left-tailed = .01. That is, do you reject the null hypothesis?
One group of accounting students took a distance learning class, while another group took the same course in a traditional classroom. At £ = .10, is there a significant difference in th
If you must estimate the population mean within 10 days, how many outside salespeople should you sample? Use the 95 percent confidence level.
A new extended-life light bulb has an average service life of 750 hours, with a standard deviation of 50 hours. If the service life of these light bulbs approximates a normal distribution, about wha
Assume the travel agent errors are normally distributed in the population. How wide is the interval? Interpret the interval.
What is the z score calculated using the sample and population information? (Hint: When you don't have the population standard deviation you can substitute the SAMPLE standard deviation.)
Formulate a payoff table that specifies the contribution to profit (in dollars) from the sale of the tennis shoes by this department store chain for each possible purchase decision (in hundreds of p
The amount of money spent by a customer is uniformly distributed over (0, 100). Find the mean and variance of the amount of money that the store takes in on a given day.
A truth serum give to a suspect is known to be 90% reliable when the person is guilty and 99% reliable when the person is innocent. In other words 10% of guilty are judged innocent by the serum and
John Rengel is the Quality Assurance Supervisor for Vino Supremo Vinyards. He knows that 10 percent of each box of corks is undersized.
What is the median number of prescriptions until the pharmacist makes the first dispensing error? Hint: find the smallest value of x such that P(X <= x) is larger than 0.50. - 23
A survey of eight hundred male office workers found that 17% of them work more than 50 hours per week. What is the 98% confidence interval for the true proportion of male office workers who work mor
The means appear to be very close, but not the variances. At α = .05, is there a difference in variances? Show all steps clearly, including an illustration of the decision rule.
Diastolic Blood pressure are assumed to follow a normal distribution with a mean of 85 and a standard deviation of 12. what proportion have diastolic blood pressures between 80 and 90?
The U.S. Department of Agriculture reports that the mean American consumption of carbonated beverages per year is greater than 52 gallons. A random sample of 30 Americans yielded a sample mean of 69
A recent study of cardiovascular risk factors reports that 30% of adults meet the criteria for hypertention. If 15 adults are assessed, what is the probability that : Exactyly 5 meet the criteria fo
the average hourly wage of workers at a fast food restaurant is 6.50 per hour with a standard deviation of .45$. assume that the distribution is normally distributed. if a worker at this fast food r
A study was conducted to estimate the mean amount spent on birthday gifts for a typical family having two children. A sample of 160 was taken, and the mean amount spent was $200. Assuming a standard
Richard has just been given a 8-question multiple-choice quiz in his history class. What is the probability that he will answer all questions correctly?
Determine the critical region and critical values for z that would be used to test the null hypothesis at the given level of significance, as described in each of the following:
A study is conducted to assess the imopact of caffeine consumption, smoking, alcohol consumption, what is the probability that: at most 6 consume caffeine and smoke?
How many measurements should be made in order to be 99% certain that the maximum error of estimation will not exceed 1 second?
Using the .05 level of significance and the five-step hypothesis testing procedure, determine if there is reason to reject the claim made by Winston Tire Company and conclude that tires last for les
if the top 5% of coffee drinkers are considered heavy coffee drinkers, what is the minimum number of cups consumed by a heavy coffee drinker?
The customer service department claims that the mean time to correct a shipping error is 10 minutes. A random sample of 60 claims from company records showed the mean to be 9.2 minutes with a stand