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In a study to compare the perceived effects of two pain relievers, 200 randomly selected adults were given the first pain reliever, and 93% indicated appreciable pain relief. Of the 450 individuals given the other pain reliever, 96% indicated experiencing appreciable relief.
a. Give an estimate for the difference in the proportions of all adults who would indicate perceived pain relief after taking the two pain relievers. Provide a bound on the error of estimation.
b. Based on your answer to part (a), is there evidence that proportions experiencing relief differ for those who take the two pain relievers? Why?
It is generally believed that electrical problems affect about 14% of new cars. An automobile mechanic conducts diagnostic tests on 128 new cars on the lot." What is the standard deviation for the sample proportion?
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You are asked to estimate the chance that the sum will be positive. Can you do it if you are also told the average and SD of the numbers in the box, but are not told the numbers themselves?
Mention the critical value of test statistic (Or give the p-value of the test.)
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One professor teaches a large section, section A, of a particular class, and on the first test of the term, the test scores in section A were approximately normally distributed with a mean of 78 and a standard deviation of 6.
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in a study subjects are randomly assigned to one of three groups control experimental a or experimental b. after
to test the efficacy of a health education program in reducing the risk of food-borne and water-borne diseases two
Could this information be viewed as representing the nominal scale of measurement? If so, explain your reasoning. If not, why not? Could this information be viewed as representing the ratio scale of measurement? If so, explain your rea- soning. I..
Here are data on attitudes toward coffee filters made of recycled paper. The data was gathered from a random sample. What is the conditional distribution of opinion about quality of recycled coffee filters for buyers?
a distribution center receives shipments of a product from three different factories in the quantities of 60 30 and
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