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Physical Sciences
Recycling of aluminum, glass, newspapers, and magazines is good for the environment and the economy. In 2013, San Francisco had the highest recycling rate in the United States30 (recycling rate = tons collected for recycling/tons of all waste generated). Despite efforts to make the process easier, many people still do not recycle. Independent random samples of residents in Ohio and in Florida were obtained and asked whether they recycle newspapers. Of the 909 Ohio residents, 700 said they recycled newspapers, and 691 of the 923 Florida residents said they recycled newspapers.
a. Is there any evidence to suggest that the population proportion of residents in Ohio who recycle newspapers is greater than the population proportion of residents in Florida? Use a = 0.01.
b. Find the p value for this hypothesis test.
an experiment was performed to investigate the keyboard feel on a computer crisp or mushy and the size of the keys
Discuss what happens to the width of the confidence interval as the confidence level is increased. Does this seem reasonable? Explain.
Why is it inappropriate to use Table AS, the F table, on these data if we wish to find out whether or not the variability of weights is the same among male and female mice?
The Internal Revenue Service (IRS) provides a toll-free help line for taxpayers to call in and get answers to questions as they prepare their tax returns.
Compute a Pearson's correlation coefficient for these data and determine whether the correlation is significant.
there are assumptions of multiple regression. one of them is the residuals are independent. this means that successive
questiona patient is seen at a clinic. a recent epidemic in town shows that the probability that the patient suffers
Find the calcium level that is the borderline between low calcium levels and those not considered low. Carry your intermediate computations to at least four decimal places. Round your answer to at least one decimal place
in each of the following situations the sampling frame does not match the population resulting in undercoverage. give
b. Compute E[(1 2 X)m]. If X represents the proportion of a substance consisting of a particular ingredient, what is the expected proportion that does not consist of this ingredient?
(a) Consider all random samples of 100 test scores. What is the standard deviation of the sample means? (b) What is the probability that 100 randomly selected test scores will have a mean test score that is between 490 and 510?
If the computed value for this problem is +2.33, and the level of significance is 0.05, can we conclude that the recall proportions for the two commercials are same?
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