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A health researcher is interested in determining whether or not the speed at which people walk is related to their cholesterol levels. He picks 100 adult volunteers at random, checks their cholesterol levels, and then times each one while they walk a stretch of 100 yards. He is amazed at the results: a simple regression between the walk times and the cholesterol levels has an R2 of 0.98 and the slope of the regression line is 0.7. Would he be justified in concluding that walking slowly may cause high cholesterol or that high cholesterol may affect walking speed? Discuss why or why not.
What is a p-value in testing hypothesis? How does this p-value help us to decide to/not to reject a Null hypothesis?
determine whether each of the distributions given below represents a probability distribution. justify your
A sample of 16 patients in a doctors office showed that they had to wait an average of 43 minutes with a standard deviation of 8 minutes before they could see doctor. Provide a 99% confidence interval for the average waiting time for all of the pa..
Mark makes it a policy not to buy bananas unless the price is 33 cents or less per pound. What proportion of the time would he buy bananas?
Suppose the people have weights that are normally distributed with a mean of 164lb and a standard deviation of 30lb. Find the probability?
The only possible, mutually exclusive outcomes of the surgery are death, relief of symptoms, (angina, dyspnea), or continuation of symptoms. The probability of death is 0.02 and the relief of symptoms is 0.80. What is the probability that the pati..
you have decided to model an input process for a simulation study using an exponential distribution for the arrival
low reliability of the variables reduces the correlation coefficient becausea. the deviation scores are less likely to
Determine margin of error for confidence interval in (a)?
Find the probability that he will answer at least 3 questions correctly.
several psychology students are unprepared for a surprise truefalse test with 12 questions and all of their answers are
Show that someone will think that the claim has more than a fifty percent chance of being true if p > q / (1 + q). Explain.
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