# Question: Refer to the oil spill case study a What are the

Refer to the oil-spill case study.

a. What are the populations of interest?

b. What are some factors other than flora density that may indicate that the oil spill has affected the marsh?

c. Describe a method for randomly selecting the tracts where flora density measurements were to be taken.

d. State several hypotheses that may be of interest to the researchers.

a. What are the populations of interest?

b. What are some factors other than flora density that may indicate that the oil spill has affected the marsh?

c. Describe a method for randomly selecting the tracts where flora density measurements were to be taken.

d. State several hypotheses that may be of interest to the researchers.

## Answer to relevant Questions

Refer to Exercise 6.9. a. Based on the values of the sample mean and sample standard deviation for magnesium, provide a reason why the distribution of magnesium does not have a normal distribution. b. Are the inferences ...Random samples of size n1 = 8 and n2 = 8 were selected from populations A and B, respectively. The data are given in the following table. a. Test for a difference in the medians of the two populations using an α = .05 ...Provide the rejection region for the paired t test for each of the following sets of hypotheses: a. H0: μd = 0 versus Ha: μd ≠ 0 with n = 19, and α = .05 b. H0: μd ≤ 0 versus Ha: μd > 0 with n = 8, and α = ...Provide the rejection region for the Wilcoxon signed-rank test for each of the following sets of hypotheses: a. H0: M = 0 versus Ha: M ≠ 0 with n = 19, and α = .05 b. H0: M ≤ 0 versus Ha: M > 0 with n = 8, and α = ...The researchers also need to obtain precise estimates of the mean difference in systolic blood pressures for people who use the anti-inflammatory drug versus those who do not. a. Suppose the sample sizes are the same for ...Post your question