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We took a random sample of 25 customers and found a mean waiting time of 22 minutes with a standard deviation of 6 minutes. We want to construct a 99% confidence interval for the population mean of such waiting times. We know that the interval we want comes from this formula : (mean)X plus or minus (t)(s)subX. What is the value of X to be used in the formula?
approximately 29 of the calls to an airline reservation phone line result in a reservation being made.a suppose that an
20% of their customers purchase package 3 and 25% of their customers purchase package 4. Find the expected value or average profit per customer.
if xsub1xsub2....xsubn constitute a random sample from a population with the mean mu and the variance use the methods
A health services provider has been reimbursed by a national health insurance organization for a large number of services. It appears that overpayments may have occurred on many of the reimbursements
The value of the z score in a hypothesis test is influenced by a variety of factors. Assuming that all other variables are held constant explain how the value of z is influenced by each of the following: (a) increasing the difference b/w the sampl..
Identify the null hypothesis, alternative hypothesis, test statistic, P-value or critical value(s), conclusion about the null hypothesis, and final conclusion that addresses the original claim.
a box contains three white and three black balls. a randomly selected ball is removed from the box. if the selected
Let x represent the hemoglobin count (HC) in grams per 100 milliliters of whole blood. The distribution for HC is approximately normal with μ = 14 for healthy adult women. Suppose that a female patient has taken 10 laboratory blood samples in the ..
imagine that there are 100 different researchers each studying the sleeping habits of college freshmen. each researcher
A p-value of 0.82 obtained for a particular hypothesis test would indicate strong evidence that the null hypothesis is true. Discuss.
What information does calculating standard deviation provide? How is the z-score related to standard deviation? What values do you need to calculate a z-score
These are the winning numbers. To win the lottery, a person must select the correct 5 numbers in the same order in which they were drawn. What is the probability of winning?
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