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The IRS reported that 62% of individual tax returns were filed electronically in 2008. A random sample of 225 tax returns from 2010 was selected. From this sample, 163 were filed electronically.
a) Construct a 95% confidence interval to estimate the actual proportion of taxpayers who filed electronically in 2010.
b) What is the margin of error for this sample?
c) Is there any evidence that this proportion has changed since 2008 based on this sample?
The diameters of bolts produced by a certain machine are normally distributed with a mean of 0.30 inches and a standard deviation of 0.01 inches. What percentage of bolts will have a diameter greater than 0.32 inches?
a researcher wants to compare how college graduates and college drop-outs feel about the legalization of marijuana. she
Heights and weights for boys and girls. Suppose you are designing a study to investigate the relationship between height and weight for boys and girls. (a) Specify a model with parallel regression lines that could be used to predict height separat..
What social, cultural, economic and political structures tied Europe together in the early middle ages? How did these patterns of connection compare to those that existed in earlier periods of European history, such as the time of Charlemagne or th..
State the formula for the test statistic and show your decision rule using the 1 percent level of significance. (c) Carry out the test. Show your work. (d) What assumptions are required?
What is the interval that is 95% certain to contain the actual proportion of people in this age group who have seen a ghost?
a factory produces 1400 beams a day which are on average 2.5 defective. find the probability out of 70 beams inspected
What kinds of things could go wrong in writing the question? Would your question provide a valid and reliable measure of the health of the respondent?
Explain the main differences among integers, rational numbers, real numbers, and irrational numbers. How are these used in everyday life? How would you explain the use of each to someone who did not know about the differences?
What percentage of overbilled customers are charged at least 10% more than they should pay?
Some IQ tests are standardized to normal model with mean of 100 and the standard deviation of 16. Draw a model for these IQ scores, clearly label it , showing what the 65-95-99.7 rule predicts about the score.
The results include x‾ = 88.9, y‾ = 165.3, SSX = 2,133.9, SSXY = 4,502.53, SSY = 12,500. Find the least-squares estimates of the regression parameters.
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