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A Peace Corps volunteer wants to see which of four species of fast-growing tropical trees will do best in a reforestation program in Haiti. She plants enough trees to obtain 2-year growth data from a random sample of 30 trees of each species. Lacking computing equipment for an analysis of data at the numerical scale of measurement, she decides to perform a median test on the following transformed data:

1758_reforestation program in Haiti.png

a. What null hypothesis can be tested with these data?

b. Give the alternative hypothesis.

c. What is the critical value of the test statistic for a = 0.05?

d. Perform the test of significance and draw a conclusion.

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