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The Australian Medical Association recently conducted a study to determine the duration of standard consultations in urban practices. The results showed that the length of consultation could be closely approximated by a normal distribution with a mean of 12.3 minutes and a variance of 9.56 minutes squared. What is the probability a consultation would last for more than a quarter of an hour? Give your answer to four decimal places.
It is estimated that 88% of senior citizens suffer from sleep disorders and 8% suffer from anxiety. Moreover, 6% of senior citizens suffer from both sleep disorders and anxiety.
Based on the morning voters only, describe the sampling distribution of P^1. Draw a figure similar to given Figure 1.- What is the mean of the sampling distribution of P^1 - P^2?
The following table represents a summary by state for Medicare enrollment (in thousands) for 15 randomly selected states in 1998 (source: Statistical Abstracts of the United States, 1999).
A stockbroker at Critical Securities reported that the mean rate of return on a sample of 10 oil stocks was 12.6 percent with a standard deviation of 3.9 percent. The mean rate of return on a sample of 8 utility stocks was 10.9 percent with a stan..
it is common in many industrial areas to use a filling machine to fill boxes full of product. this occurs in the food
Find the least-squares regression equation of Y on X1 and X2 and interpret the results of part a.
a set of test scores is normally distributed with a mean of 100 and a standard deviation of 15. if cases are drawn
Use the normal approximation of the binomial probability distribution to find the interval that contains 95.44% of that distribution.
Six industrial workers were chosen for a study of the effects of rest periods on production.- Perform an appropriate nonparametric statistical test on the results shown in the following table.
Since over 10,000 students in his state took the Math SAT, he can show that the P-value for testing whether the mean score in his state is more than the national average of 480 is less than 0.0001. What we can conclude from this?
Assuming that a hypothesis test of the claim has been conducted and that the conclusion is failure to reject the null hypothesis, state the conclusion in nontechnical terms.
Develop upper and lower control limits (99.7%) for the proportion of students with complaints.
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