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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?
in a study of exercise a large group of male runners walk on a treadmill for 6 minutes. their heart rates in beats per
schedulingscheduling is explicitly part of our lives. we schedule everything and need to in order to plan our
The number of UFO (Unidentified Flying Object) sightings per week in Roswell, NM is a random variable with the cumulative distribution function given below.
The final grades given by two professors in introduction to operations research course have been carefully examined. The students in the first professor's class had a grade point average of 3.0 and a standard deviation of 0.2.
there are 30000 students enrolled at city university. 1 a simple random sample of 400 city university students was
The number of hours a light bulb burns before failing varies from bulb to bulb. The distribution of burnout times is strongly skewed to the right. The central limit theorem says that
the beer institue conducted a study with looking at beer purcheses per capita across states. some states buy more beer
What is true about the two values
Conduct a one-tailed hypothesis test given the information below. A certain brand of Green Energy light bulbs was advertised as having an average illumination life-span of 2,500 hours.
The yield strength of a metal bolt has a mean of 6,050 pounds with a standard deviation of 100 pounds. Twenty samples of three bolts were tested, resulting in the means shown below.
The following data are indexed prices of gold and copper over a 10-year period. Assume that the indexed values constitute a random sample from the population of possible values. Test for the existence of a linear correlation between the indexed pr..
A professor of statistics refutes the claim that the average student spends 3 hours studying for the midterm exam. Which hypothesis is used to test the claim
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