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The accompanying data were read from graphs that appeared in the article "Bush Timber Proposal Runs Counter to the Record" (San Luis Obispo Tribune,September 22, 2002). The variables shown are the number of acres burned in forest fires in the western United States and timber sales.
a. Is there a correlation between timber sales and acres burned in forest fires? Compute and interpret the value of the correlation coefficient.
b. The article concludes that "heavier logging led to large forest fires." Do you think this conclusion is justified based on the given data? Explain.
What is a hypothesis test? Why do we need to use them to make decisions about relating sample results to the population; why can't we just make our decisions by the sample value?
Convert Alisha's grandmother's score to a z score among the distribution of exercise capacity in Americans over seventy years old. Who has a relatively longer exercise capacity compared to her peers-Alisha or her grandmother?
comparison of paired and unpaired samples test.in january 08 fifty clients of a county mental health mental retardation
Assume you have the following data: H1: µ ? 200, S =30, n = 64, and X =218. Conduct a two tailed hypothesis test at the 0.05 significance level.
assume that adults have iq scores that are normally distributed with a mean of u105 and a standard deviation o15. find
1.students often incorrectly believe that inference for a population proportion based on the sample proportion is
Use the runs test with the normal approximation and a = 0.05. Find the p value associated with this test.
Qualitative research often generates large amounts of data that must be gathered and analyzed. The use of statistical software such as the Statistical Package for the Social Sciences (SPSS) can significantly simplify and enhance the analysis of qu..
Is there an effect due to development time? Plot the mean density for each developer strength for each development time.
How many participants would be required to ensure that a 95% confidence interval for the mean difference in the number of drinks is within two drinks of the true mean? Assumed that the standard deviation of the difference in the mean number of dri..
Find the probability distribution of X. - What is the probability that this project will be completed in less than three months from now?
Find the probability that a random sample of 4 male Siberian tigers will have a sample mean weight more than 450 lb.
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