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A random sample of students was weighed after their first week of their first semester and weighed again after their final week of their first semester. Is there strong evidence that the students gained weight during their first semester? The summary statistics are as follows:
Regression and Correlation are two of the most often used and abused tools in research. People are quick to jump to conclusions that if a relationship exists between two variables, then one must cause (causation) the other.
an internet retailer stocks a popular electronic toy at a central warehouse that supplies the eastern united states.
Mazda 6s resulting from a 10-mph crash into a concrete wall, the research group tests six cars of this type and assesses the amount of damage. Describe the population and sample for this problem.
Consider the following situation describing layoffs at a manufacturing plant of the Monsanto Company. Does there appear to be a case of age discrimination between those laid off and those non-laid off?
1. the labor relations manager of a large corporation wished to study the absenteeism among workers at the companys
assume that you are testing ho p .5 vs. ha p gt .5 and that based on the collected data the p-value of the test is
If one of the Titanic passengers is randomly selected, find the probability of getting a woman or someone who didn't survive the sinking.
For the total population of a large southern city, mean family income is $34000, with a standard deviation (for the population) of $5000.
a population of 1000 voters contains 330 republicans 620 democrats and 50 independents and members of other parties. a
forty-three percent of adults say they get their financial advice from family members. you randomly select 14 adults
we are studying the proportion of cities that have private garbage collector. we want a maximum error of 0.10 and a 95
An electric power trading company has an option to buy 1,000,000 terawatts of electricity from a producer for $10 per terawatt. Other electric power trading companies have received this option and the company knows a decision must be made quickly.
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