Interpret the results of a well-designed experiment.
Example Problems
In a study of college freshmen, researchers found that students who watched TV for an hour or more on weeknights were significantly more likely to have high blood pressure, compared to those students who watched less than an hour of TV on weeknights.
Does this mean that watching more TV raises one's blood pressure? Explain your reasoning.
Does this mean that watching more TV raises one's blood pressure? Explain your reasoning.
A is loosely defined as the largest expected size of the difference between an estimate and the actual population value that is being estimated.
Generally speaking, do you think that when proper random sampling occurs, the for estimating a population mean gets smaller or larger as the sample size increases?
Generally speaking, do you think that when proper random sampling occurs, the for estimating a population mean gets smaller or larger as the sample size increases?
Fred's Flare Company developed a new chemical process for roadside flares. The old flares burned for minutes on average, and Fred hopes the new flares burn slightly over minutes, or over hours, on average so that packages can state, "Now burns for over 2 hours on average." To check whether this claim is reasonable for the population of all flares manufactured, the company must periodically sample flares and check their burn times.
If every manufactured flare was sampled, that would be called a census, and the population average burn time could be computed directly. Give at least one reason why a census would not be feasible in this case.
If every manufactured flare was sampled, that would be called a census, and the population average burn time could be computed directly. Give at least one reason why a census would not be feasible in this case.
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