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Question: Acid rain. A study of the effects of acid rain on trees in the Hopkins Forest shows that 25 of 100 trees sampled exhibited some sort of damage from acid rain. This rate seemed to be higher than the 15% quoted in a recent Environmetrics article on the average proportion of damaged trees in the Northeast. Does the sample suggest that trees in the Hopkins Forest are more susceptible than trees from the rest of the region? Comment, and write up your own conclusions based on an appropriate confidence interval as well as a hypothesis test. Include any assumptions you made about the data.
A steel pipe fittings company claims that the yield strength of its nontempered couplings is more variable than that of its tempered couplings. A random sample of nine tempered couplings has a standard deviation of 13.1 megapascals
A local government wants to determine whether taxpayers support increasing local taxes to provide more public funding to schools.
Classify each of the following random variables as discrete or continuous.- The number of trees over six feet tall.- The moisture content (expressed as a percentage) of a randomly selected tree.
consider the following experiment a ball is drawn without replacement from an urn containing two red and three blue
If your company makes a particular decision in the face of uncertainty, you estimate that it will either gain $10,000, gain $1000, or lose $5000.
What were the key events that marked the move toward American Independence?
Find a peer-reviewed article that provides an example of a study where the researchers utilized a one sample chi-square OR a two sample chi-square. Briefly describe the study and discuss its findings in your own words.
To estimate the mean of the population from sample information, we need to calculate the standard deviation of the distribution of the sample means around the population mean.
The Gallup Organization polls 1000 individuals to estimate the percent of American adults who approve of the President's job performance.
state the null and alternative hypotheses for the following conjecture a researcher thinks that if expectant mothers
information from the department of motor vehicles indicates that the average age of licensed drivers is micro 45.7
In a random sample of 100 voters, what is the probability that the sample will indicate a dead heat (fifty-fifty)?
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