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Mary claims that the range, standard deviation and variance are all measures of dispersion. John adds to Mary's claim by stating that the coefficient of variation is a measure of relative dispersion. Do you agree with both Mary and John? Why?
These individuals are then examined and categorized as to whether they have a heart disorder. The observed frequencies are as follows:
Calculate the sample mean and sample standard deviation.
A population is normally distributed with the mean of 100 and a standard deviation of Would it be unusual for mean of sample of 3 to be 115 or more? Why or why not?
If you are told a population has a mean of 25 and a variance of 0, what must you conclude? a) Someone has made a mistake. b) There is only one element in the population.
A sample of 100 widgets from the Acme production line shows that the average lifespan of these parts is 900 hours. The standard deviation of production has been 200 hours historically and is known to be normally distributed.
A researcher used stepwise regression to create regression models to predict Birthrate (births per 1000) using five predictors:
We are interested in comparing the proportions of males and females who think earning a large salary is very important to them. I surveyed 200 of each gender and recorded their answers to the question as yes or no.
Assume that the process is in control and that the population of all jar fills is normally distributed.
Below are revenue and profit (both in $ billions) for nine large entertainment companies.
Suppose that 0.6 of the present 25,000 vehicle occupants killed in collisions were not wearing seat belts. There are about 170 million registered cars and trucks on the highway today.
What is the numerical value of the sample proportion p^ ? The P-value is the probability of what event?
Suppose you bid $12000. What is the probability that your bid will be accepted?
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