Question 2
(12 pts)
Based on a World Health Organization (WHO) report, the mean hemoglobin level for a population of children is 112 grams/Liter and the standard deviation is 9 grams/Liter. A medical center in the Midwest wants to know if the mean hemoglobin level has decreased, so some research doctors conduct a study of a random sample of 110 children and find that the mean hemoglobin level is 108 grams/Liter with a standard deviation of 11 grams/Liter.
Select the correct answers to these questions:
- What are the degrees of freedom for the t-distribution of the test statistic?
109 - What is the test statistic for this example?
-3.81 - Which of the following graphs matches the p-value corresponding to the alternative hypothesis?
C