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A report states that 44% of home owners have a vegetable garden. How large a sample is needed to estimate the true proportion of home owners who have vegetable gardens to within 5 percentage points with 92% confidence?
According to a recent survey, 275 of 400 middle-aged Americans said they used the Internet regularly. 140 of 400 senior citizens said they used the Internet regularly.
Construct a 99% confidence interval for the population mean tread wear for this type of tire.
In a poll of 150 randomly selected adults 78 said they favored a new proposition. compute a 95% confidence interval for the proportion of all adults in favor of the proposition at the time of the poll.
Determine the variance of X? (Illustrate your computation either in Table or in Equation form)
Alcohol appears to be involved in a variety of birth defects, including low birth weight and retarded growth. A researcher would like to investigate the effect of prenatal alcohol on birth weight.
Determine the 95% confidence interval for true percent of car owners in this city who received the speeding ticket this year. Explain your results to nearest hundredth of percent.
Suppose that $126,000 is to be allocated for advertising, research, and investment in the ratio 10:4:2. How much money will be allocated for each?
Explain which data techniques you are most familiar with/have used: in a previously done project that involved the collection and analysis of data and explain why the examination of collected data is so important.
In order to estimate the proportion of families who prefer female baby-sitters to male baby-sitters with an error of at most 8 percentage points and with at least 95 percent confidence, how large a sample should be taken?
a. What is the probability that one randomly selected student scores above 1100 on the GRE? b. Describe the sampling distribution of the sample mean for the 16 students.
Use the following graph of a function f to determine x or y to the nearest integer as indicated. Some problems may have more than one answer.
In 2001, the US Department of Labor reported the average hourly earnings for US production workers to be $14.32 per hour. A sample of 75 production workers during 2003 showed a sample mean of $14.68 per hour.
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