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1. A pharmaceutical manufacturer has come up with a new drug intended to provide greater headache relief than the old formula. Of 250 patients treated with the previous medication, 130 reported "fast relief from headache pain." Of 200 individuals treated with the newformula, 128 said they got "fast relief." At the 0.05 level, can we conclude that the new formula is better than the old? Using the appropriate statistical table, what is the approximate p-value for this test?
2. In tests of a speed-reading course, it is found that 10 subjects increased their reading speed by an average of 200 words per minute, with a standard deviation of 75 words. At the 0.10 level, does this sample information suggest that the course is really effective in improving reading speed? Using the appropriate statistical table, what is the approximate p-value for this test?
Compute the phi-coefficient for these data and compare it with the result from problem 13. You should find that the sample size has no effect on the strength of the relationship.
a confidence interval for the price of gasoline from a random sample of 40 gas stations in a region gives the
There are many nonparametric tests that have been developed over the years. Explain what nonparametric tests are and why they were developed.
Find out annual break-even volume for the Rolling Creek Textile Mill.
At the 5% level of significance, would we reject the null hypothesis that the mean breaking load is 510 pounds or more?
question 1.nbspa large scale marketing survey was conducted. some of the variables collected weregender nbsp
one slot machine pays off 12 of the time while the other pays off 14 of the time. we pick one of the machines and play
You have just started own airline. You have one plane for a route connecting Austin, Boise, and Chicago. One route is Austin-Boise-Chicago and a second route is Chicago-Boise-Austin.
The accompanying table summarizes randomly selected sample data for San Francisco Defendants in burglary cases.
the number of carbohydrates in grams per 8-ounce serving of yogurt for each of a random selection of brands is listed
A month of sales data are collected on sales of different types of computer products Run the t-tests to determine:
A central university has a student population of 60,000. The university is interested in determining what proportion of them is in favour of a new grading system.
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