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1. More people get colds during cold weather than during warm weather. Does that prove that cold temperatures cause people to get colds? What is a potential confounding factor?
2. A study showed that children who watch more than two hours of television each day tend to have higher cholesterol levels than children who watch less than two hours of television each day. Can you think of any use for the result of this study?
A company produces two products that are processed on two assembly lines. Assembly line 1 has 100 available hours, and assembly line 2 has 42 available hours.
What are the mean and standard deviation of the sample proportion who are at least 75 years of age in samples of 250 respondents?
if a production manager wanted to determine whether or not the first shift was processing more widgets than the second
Survey on marital status to determine whether the data is qualitative or quantitative
the power generated by a solar electric generator is normally distributed with mean 15.6 kilowatts and standard
suppose we roll one die repeatedly and let ni be the number of the roll on which i first appears. find the joint
the number of taxicabs waiting outside a popular downtown bar can be modeled as a poisson random variable. the
A sample of 64 statistics students at a small college had a mean mathematics ACT score of 28 with a standard deviation of 4. Estimate the mean mathematics ACT score for all statistics students at this college. Give the 95% confidence interval.
Charmers' Candy Store sells wrapped hard candies in the following flavors: strawberry, blueberry, lemon, lime, and orange. They advertise that there are equal proportions of each flavor in every size of their candy boxes.
small sample mean problem. the maker of mini-oats cereal uses an automated packaging machine to pack its 24 ounce box
in a poll of 600 voters in a campaign to eliminate non-returnable beverage containers 210 of the voters were opposed.
A consumer protection group is concerned that a ketchup manufacturer is filling its 20-ounce family-size containers with less than 20 ounces of ketchup.
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