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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.
Six groups of randomly selected students matched for IQ and age were formed. Each student was taught a concept of time by using one of three methods: Lecture, demonstration
Mean of 61 minutes and a standard deviation of 9 minutes. Find the proportion of runners who take more than 70 minutes to finish. Draw a sketch to show this proportion.
A recent study of 50 self-service gasoline stations in the Greater Cincinnati' Northern Kentucky metropolitan area revealed that the mean price of unleaded gas was $2.029 per gallon. The sample standard deviation was $0.03 per gallon.
the table shows the results of a survey in which 622 men and 644 women ages 25 to 46 were asked if they like coke or
a explain the difference between a type i and type ii error and why failing to reject a null hypothesis is not the
What is the probability that none of the lines experiences a surface finish problem in 40 hours of operation. What is the probability that all three lines experience a surface finish problem between 20 and 40 hours of operation.
A retailer finds that the demand for a very popular board game averages 100 per week with a standard deviation of 20. If the seller wishes to have adequate stock 95% of the time.
With probabilities 0.8, 0.1, 0.08 and 0.02 respectively. A particular company offers a $500 deductible policy. If the company wishes its expected profit to be $100, what premium should it charge?
Using this he gives a cost estimate of $24,000 for a new order for 500 units. Is this a reasonable cost estimate? Explain why or why not. Looking at the data on file, can you give a better cost estimate?
Elizabeth Bailey is the owner and general manager of Princess Brides, which provides a wedding planning service in Southwest Louisiana.
In a randomized, double-blind, placebo-controlled trial of children, echinacea was tested as a treatment for upper respiratory infections in children.
A pilot survey reveals that 5 of the 50 sampled hold two or more jobs. How many in the workforce should be interviewed to meet your requirements?
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