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Random samples of size n is greater than or equal to 50 are drawn to a population and the mean x bar for each sample is computed. Will the distribution of x bar always be approximately normally distributed, or does it depend on the distribution of the population?
Use the given contingency table to (a) find the expected frequencies of each cell in the table, (b) perform a chi-square test for independence, and (c) comment on the relationship between the two variables.
Explain why it might be important to look at cancer incidence that is age-adjusted rather than just cancer incidence. Perform simple linear regression on these data and report your finding.
Marconi Shipping Company packages their shipments in 50 ton containers. History has shown that the shipping department reports that the distribution of container weights follows the normal distribution
If she actually has 55% of the total vote, what is the probability of getting a sample proportion this small or smaller? Do you think she actually has 55% of the vote? Why or why not?
The bank wants to find out the waiting time of their customers during the Friday evening hours from 5pm to 8pm. Using the data in ungrouped form, compute the Standard Deviation, using the computational formula.
What signified to you on all of the problems that required a normal distribution that you were to use a normal distribution? Which problems required a normal distribution?
0.8 of all college students like the idea of a new curriculum. If we select 87 students (ASSUME INDEPENDENCE), what is the Standard Deviation of the Probability Distribution that would list the number of students.
A company has developed the new battery, but the average lifetime is unknown. In order to estimate the average, a sample of 150 batteries is tested and an average lifetime of this sample is found to be 250 hours.
According to the U.S. Bureau of the Census, 75% of adults regularly drank alcohol in 1985. An investigator predicts that fewer adults drink now than drank then.
The chart at the right. Does this sample indicate that songs classified as dance music have lower beats per minute than the songs ranked on a Top 200 list?
Find the optimal order quantity and what is the optimal total ordering cost per year vs. what is that cost with the current policy?
Find the mean number of radioactive atoms lost through decay in a day. Find the probability that on a given day, 50 radioactive atoms decayed.
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