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A pharmaceutical company conducts a study to evaluate the relationship between length of time taking drug X and size of tumor. They enlist 2400 patients with the same type of benign tumor who have been on drug X for varying lengths of time (measured in days). They find that the longer the patient is on the drug, the smaller the patient's tumor size (measured in volume). In fact, they report the results asr(2398) = -.21, with significance of p < .0001. What is your initial perception of this information? What are other ways, beyond looking at the p-value alone, you could use to try to interpret what this outcome of r(2398) = -.21 tells us about the relationship between length of time taking drug X and the size of the tumor? Support your responses.
What is the probability that a person who has submitted one entry will win the following?
Compute the mean, median, mode and standard deviation for the following discrete probability distribution.
How many boxes must the processor sample to be 95 percent confident that the sample mean does not differ from the population mean by more than 0.2 pounds?
We want to know if his support has decreased. In computing a test of hypothesis with , what is the estimate of the overall proportion?
Re item 4, assume the critical value for this test is 4.92, and you obtain a computed statistical value of 7.45. Is there evidence to refuse null hypothesis? Describe why or why not?
A bond analyst is analyzing the interest rates for equivalent municipal bonds issued by two different states.
Describe your answer to a person who has never had a course in statistics.
Polls showed the two main candidates in 2004 presidential election were nearly tied on the day before the election. To predict the winner a newspaper would like to have a poll that has a margin of error of less than 1%.
What proportion of the variability in steel shipments for motor vehicles is described by regression equation?
What is the probability that a randomly chosen eight-week old baby smiles between 2 and 18 seconds?
Estimate the population means growth in 1 year for 14-year-old boys. Make a point estimate and an 80% confidence interval estimate.
Formulate the hypotheses to determine whether or not the lathe is in perfect adjustment.
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