To test the effectiveness of a business school preparation course, 8 students took a general business test before and after the course. Suppose the before and after exam scores are both normally distributed. Which of the following tests will be the most appropriate?
A) Pooled-variance t test B) McNemar test
C) Wilcoxon rank sum test D) Paired t test
Question 2
The use of preservatives by food processors has become a controversial issue. Suppose 2 preservatives are extensively tested and determined safe for use in meats. A processor wants to compare the preservatives for their effects on retarding spoilage. They will choose to use the preservative that can keep the meat fresh for the longest amount of time. Suppose 15 cuts of fresh meat are treated with preservative I and 15 are treated with preservative II, and the number of hours until spoilage begins is recorded for each of the 30 cuts of meat. Suppose the variability of the number of hours until spoilage is the same for meat treated by both preservatives but the normal probability plots reveal that the number of hours until spoilage is right-skewed for the 15 cuts treated by preservative I and left-skewed for the 15 cuts treated with preservative II. Which of the following tests will be the most appropriate?
A) Levene's test B) Wilcoxon rank sum test
C) Pooled-variance t test D) Paired t test
Children in Baltimore (1909) pull the stringy parts from beans in preparation for canning. Photograp
These photos show a rat burying a test object from which it has just received a single mild shock.
a) Radioimmunosorbent test (RIST); (b) radioallergosorbent test (RAST).
Use tap water when making coffee, tea, or juice from concentrate, and for food preparation
The Romberg test for balance
Test of Yanofsky’s Proposed trp Operon Gene Order