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You are at a wetland site. You have been instructed to test forchromium contamination. Suppose that a regulatory agency hasdetermined that a population mean chromium concentration equal to 7mg/kg characterizes the no-contamination state. Likewise, apopulation mean chromium concentration significantly greater than 7mg/kg characterizes the contamination state. Suppose that 12 soiltests were conducted around different areas around the wetlandsite. Their chromium concentration analyzed with the followingresults. Use this information for the first 9 problems. Do notround show all steps for problem.

6.223 6.995 10.333 7.265 7.833 7.111

6.986 8.934 9.167 7.505 7.301 7.213

1. Describe the population of interest and hypothesizedparameter for this scenario.

2. Find the mean of the sample. Use the formula and show thesteps for finding the sample mean.

3. Find the median of the sample. Use the formula and show thesteps for finding the sample median.

4. Find the standard deviation of the sample. Use the formulaand show the steps (add steps to another page if necessary).

5. Using the appropriate symbols, write the hypotheses.

6. Calculate the test statistic showing the work with theformula.

7. Using StatCrunch, determine the p-value for the hypothesistest using the appropriate probability distribution (do not justuse the t test for a single mean output).

8. Make the decision for the test in terms of the nullhypothesis. Explain how you arrive at this decision.

9. Write the conclusion with minimal statistical jargon andanswer the research question of interest as demonstrated in thepresentations.