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Annual starting salaries for college graduates with degrees in business adminstration are generally expected to be between $30,000 and $45,000 with a population standard deviation of $3750. Assume that a 95% confidence interval estimate of the population mean annual starting salary is desired. How large a sample should be taken if the desired margin of error is
a.) $200.00
b.) $100.00
a loan officer at a bank rates applicants for credit. ratings are normally distributed. the mean is 240 and the
This information was also obtained from monitored calls. At the .05 significance level does it take longer to resolve software issues? What is the p-value?
A random sample of size 10 is selected from the N (20, 5) distribution. What is the probability that the variance of this sample exceeds 10?
Consider a random sample of 200 shafts, and let X denote the number among these that are nonconforming, what is the (approximate) probability that X is: At most 30.
you are asked to determine whether or not brunette students have a higher iq score than other students. to do so you
Use the interaction plot to argue that the new design is less sensitive to changes in environmental conditions (temperature and humidity). What limitations apply to this argument?
A biologist has found that the average weight of 12 randomly selected adult mud turtles is 8.7 lb. with standard deviation 3.6 lbs. Construct a 99% confidence interval for the population mean weight of adult mud turtles.
At a party there are 30 students over age 21 and 20 students under age 21. You choose at random 3 of those over 21 and separately choose at random 2 of those under 21 to interview about attitudes toward alcohol.
post your response to the following questions and participate in the discussion with your fellow students during the
She wants to be 95% confident that her estimate is correct. If the standard deviation is $1050, how large a sample is needed to be accurate within $200?
A local grocery store wants to estimate the mean daily number of gallons of milk sold to customers. Assume the number of gallons sold follows the normal distribution with a population standard deviation of 5.10 gallons.
Specify the appropriate null and alternative hypotheses if we wish to test the research hypothesis that the mean GHQ score for all employed men exceeds 10.
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