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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 as r(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.
Compute the value of the test statistic. (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.)
Using the stem and leaf technique, construct a less-than cumulative frequency distribution. -Draw to scale a histogram, frequency polygon and less-than cumulative ogive using the information from 1.
Describe the assumptions of normality and homogeneity of variance. When these assumptions are violated, what are your options?
a small gasoline station next to an interstate highway is open for 24 hours per day and has one pump and room for two
In a Sgallop poll of 1012 randomly selected adults, 9% said cloning of humans should be allowed. Use a .05 significance level to the test claim that less than 10% of all adults said that cloning should be allowed.
Estimating confidence interval for mean value of y and find a 95% confidence interval for the expected average total sleep time for a child of age 12
the time to failure density function pdf for a system is ft 0.01 0ltt lt100 daysfind a rtb the hazard rate functionc
One set of 12 pairs of scores, X and Y values, produces a correlation of r = 0.90. If SSy = 200, find the standard error of estimate for the regression line.
a hockey team has 6 forwards 4 defensemen and 2 goalies. at any time 3 forwards 2 defensemen and 1 goalie can be on the
ACT scores are normally distributed with mean 18 and standard deviation 6. Assuming that both tests measure the same kind of ability, who has the higher score, and why?
Suppose a random sample of 25 swatches are selected. What is the probability that the mean of the sample is less than 235 pounds per square inch.
Would the mean, median, or mode of the prices of recent home sales be the best measure of central tendency and why?
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