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Suppose you were trying to decide which of two machines to purchase. Furthermore, suppose the length to which the machines cut a particular product part was important. If both machines produced parts that had the same average length, what other consideration regarding the lengths would be important? Why?
a) Median length, avoiding outliers
b) Variability, greater variation is more desirable
c) Variability, less variation is more desirable
d) Total length, which machine is better overall
In a random sample of 10 adults from a nearby county, the mean waste generated per person per day was 4.35 pounds and the standard deviation was 1.88 pounds.
We have a deck of 52 playing cards. What is the probability of drawing?
An education expert is researching teaching methods and wishes to interview teachers from a particular school district. She randomly selects ten schools from the district and interviews all of the teachers at the selected schools.
Which of the following events are disjoint and What proportion of the females rated their intelligence less than 7.
The following table gives the coal usage and electricity generated by ten randomly selected power stations in South Africa in 1992:
At a used-book sale, 100 books are adult books and 160 are children's books. Of the adult books, 70 are nonfiction while 60 of the children's books are nonfiction. If a book is selected at random, find the probability that is is:
Organize data into a frequency distribution. How many classes would you propose? What value would you propose for class interval?
Number of miles flown in a One- year period by the sample of "frequent flyers" was recorded. Is this a grouped or an ungrouped frequency distribution?
The managers of a brokerage firm are interested in finding out if the number of clients a broker brings into the firm affects the sales generated by the broker.
Testing for two Proportions - Is the difference between the averages statistically significant?
Find out a 95% confidence interval for the proportion p of adults who have a great deal of trust and confidence in the executive branch of government.
Compute average daily rainfall in the week and for weekends. Get the average of weekdays' rainfalls and average of weekend's rainfalls.
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