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According the the U.S. Department of Education, full-time graduate students receive an average salary of $12,800. The dean of graduate studies at a large state university in PA claims that his graduate students earn more than this. He surveys 46 randomly selected students and finds their average salary is $13,445 with a standard deviation of $1800. With alpha = 0.05, is the dean's claim correct?
Jack is doing a project in educational psychology. Before the experiment, he rank-orderes all his participants according to achievement test scores.
Does correlation equal causation? Does the strength of correlation depend on the direction of the relationship? What is the meaning of a zero correlation? Explain your answers.
given the heights of women are normally distributed with a mean of 63.6 inches and a standard deviation of 2.5 inches.
Medication, 47% take cholesterol-lowering medication, and 12% take both medications. What is the probability that a senior citizen takes either blood pressure-lowering or cholesterol-lowering medication?
the mean and max 90th percentile elasped time to repair an item is 2.3 hours and 5.4 hour respectively.the time to
Temperature in certain city for the month of June follows a uniform distribution over the interval 61° F to 91° F. Find the temperature which 90% of the June days exceeds?
Normal distribution of 5 pounds per square inch, standard deviation of 1.5 pounds per square inch, what proportion have less that 3.17 pounds per square inch, at least 3.6 pounds, are between 5 and 5.5 and 95% will be contained between what two va..
city records indicate that the average age of the houses on the west side of town is 43 years with standard deviation
a sample of women were divided into four age groups group a 20-45.9 group b 46.0-55.9 group c 56.0-65.9 and group d 66
Draw a histogram of the sample means. Do you notice a difference in the shape of the distribution of sample means compared to the shape of the population distribution?
the following data represents the time it takes a company to respond to an account inquiry for opening a new account.a.
What is the p-value? Use a .05 level ofsignificance. What is your conclusion?
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