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A sample of 126 corporate managers and another sample of 168 college professors produced mean job-related stress scores of 7.35 for the managers and 6.86 for the professors. Suppose that the standard deviations of the stress scores are 1.12 for the managers and 1.82 for the professors. The null hypothesis is that the mean stress scores are the same for corporate managers and college professors, while the alternative hypothesis is that the mean stress score for managers is different from the mean stress score for professors. The significance level for the test is 1%. What are the critical values of z?
a study of 31000 hospital admissions in new york state found that 4 of the admissions led to treatment-caused injuries.
suppose that wait times for customers at a grocery store cashier line are uniformly distributed between one minutes and
a builder claims that air conditioners are installed in at least 85 of all homes being constructed today in the city of
Three hundred students took a chemistry test. You sampled 50 students to estimate the average score and the standard deviation. How many degrees of freedom were there in the estimation of the standard deviation
you conducted a chi-square goodness of fit test in your asci 691 capstone project. unfortunately you did not get the
Construct a probability distribution for Y.- What is the probability that at least one physician attended a Canadian medical school?
Estimate the total number of cases sold along with the standard error of your estimate. Estimate the average number sold per supermarket, along with the standard error of your estimate.
the waiting time at a certain bank is approximately normally distributed with a mean of 3.7 min and a standard
A company decides to add 20% to its equivalence principle premiums as a protection against unfavourable experience. In each of the following cases, find the probability that premiums will cover claims.
What are the assumptions underlying a normal distribution? What are the assumptions underlying a binomial distribution? Why do we want to assume that our sample data represent a population distribution?
Record the tumor grade and whether the patient was still alive one year after surgery. University Hospital County Hospital Private Hospital Which hospital has the best record?
a sample of n 25 individuals is selected from a population with fx 80 and a treatment is administered to the sample.
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