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Are podcasts a drain on students' time, or does the information they contain help students do better in school? You collect data on the number of pod - casts each student downloads per month and each student's GPA. When we calculate regression equations (just as when we calculate cor relation coefficients), it's important to construct a scatterplot first. Let's say that really poor students don't download podcasts very often, maybe because they don't use their computers much at all, and really good students don't download podcasts very often, maybe because they're too busy studying to have time to listen. Explain how this might present a problem if we calculate a simple linear regression equation to predict GPA from number of podcasts downloaded, and explain how a scatterplot might help us identify the problem.
What is the baseline risk of invasive breast cancer, assuming that the placebo group is representative of the relevant population of women?
Determine the probability that between 5 and 10 minutes will pass between successive occurrences.
What are the means and standard deviations of the two sample proportions p^1 and p^2?- Use the addition rule for means of random variables: what is the mean of D = p^1 - p^2?
A random sample of 40 days last year showed that Larry Clark made an average of 4.77 calls per day. For a sample of 50 days George Murnen made an average of 5.02 calls per day. At the .05 significance level, is there a difference in the mean numbe..
Compute the ‘net' expected values for each product (i.e. expected value for its success minus expected value for its failure). Based on these ‘net' expected values, which product should the company pick?
Carry out the Wilcoxon rank sum test. State hypotheses and give the rank sum W for high- progress readers, its P-value, and your conclusion. Do the t and Wilcoxon tests lead you to different conclusions?
if x units of product cost c dollars to manufacture and earn revenue of r dollars the values of x where the expressions
Suppose you think this ad exaggerates the temperature upwards, and you look at a random sample of 30 Christmas days and find an average of 50º and standard deviation of 8º. Conduct the test and give the p-value.
Suppose a population has a mean weight of 180 pounds and a standard deviation of 25 pounds. A sample of100 items is drawn from this population. What is the standard error of the mean?
Formulate and solve a linear programming model for Julia that will help you advise her on which offer to accept from the director if any. Julia's younger brother who is a freshman at Tech wants to help Julia increase her profits by loaning her so..
lara wang is planning a driving tour. while she is interested in seeing the twelve national monuments listed here she
researchers conducted an experiment in which hydrogen concentration in 20 different specimens was measured by gas
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