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A test to see if U.S. cardinals are significantly younger than cardinals worldwide produces a P-value that is considerably greater than 0.05. Based on this result, statistics students are asked to reach a conclusion about the mean age of U.S. cardinals compared to that of cardinals worldwide. Whose answer is best? Adam: If the P-value is not small then there must be a large difference. We've proven that U.S. cardinals are younger. Brittany: You can't say we've proven them to be younger, but you can say we have evidence that they're younger. Carlos: If the P-value is not small, then the difference we observed is not so improbable if U.S. cardinals were the same age as cardinals worldwide. So we've proven that U.S. cardinals are the same age as cardinals worldwide. Dominique: The P-value is not small, so we failed to produce evidence that U.S. cardinals are significantly younger. That's not the same thing as proving them to be the same age.
Using an estimated standard deviation of $13,500, what sample size do you need to have a margin of error equal to $1100 with 95% confidence?
The following table shows SAT scores (on the old SAT with only two sections) for a sample of students. Give the equation of the least squares regression equation.
the brightness of a television picture tube can be evaluated by measuring the amount of current required to achieve a
Plot a scatter diagram of the results with Depth of Water as the independent variable.
the weekly mean income of a group of executives is 1000 and the standard deviation of this group is 100. the
Solve by completing the square: Solve using the square root property:
a student curious about the average number of chocolate chips in a commercial brand of cookie estimated the standard
Lowering the drinking age. A July 2007 Gallup Poll asked a random sample of 464 adults whether they would favor or oppose a federal law that would lower.
Six employees who have formed a car pool. If only four of these employees can drive, how many possible seating arrangements are there for the group?
The student body of a large university comprises 60% female students. Elucidate what is the probability that the students in the sample exactly two are female?
in a university statistics course a correlation of -0.8 was found between numbers of classes missed and course grade.
Two of them at least must land the same way. No matter whether they land heads or tails, the third coin is equally likely ot land either the same way.
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