Diet and Birth Weight An obstetrician wanted to determine the impact that three experimental diets had on the birth weights of pregnant mothers. She randomly selected 27 pregnant mothers in the first trimester of whom 9 were 20 to 29 years old, 9 were 30 to 39 years old, and 9 were 40 or older. For each age group, she randomly assigned the mothers to one of the three diets. After delivery, she measured the birth weight (in grams) of the babies and obtained the following data:

(a) Birth weights are known to be approximately normally distributed. Verify the requirement of equal population variances.

(b) Determine whether there is significant interaction between age and diet.

(c) If there is no significant interaction, determine whether there is significant difference in the means for the three age groups. If there is no significant interaction, determine whether there is significant difference in the means for the diets.

(d) Draw an interaction plot of the data to support the results of parts (b) and (c).

(e) If there is significant difference in the means for the three age groups, use Tukey’s test to determine which pairwise means differ using a familywise error rate of . If there is significant difference in the means for the diets, use Tukey’s test to determine which pairwise means differ using a familywise error rate of .

Global cybersecurity spending by critical infrastructure industries exceeds $50 billion annually, and is rising above 10 percent annually. Security is major concern for all businesses, yet complete security is something most businesses cannot financially afford to install. Discuss.

Michelin is featured in the opening chapter case as a firm that engages in excellent strategic planning. This exercise gives you practice conducting an external strategic management audit to determine if Africa is the new, best place for Michelin to produce and market products and services. For example, considerable underground mining occurs in much of Africa. The new MICHELIN XTXL tire is available in 25-inch for underground mining vehicles. The new tires offer enhanced safety and productivity and are available in sizes 26.5R25 and 29.5R25. Tests indicate that the new tires offer increases of 10 percent in longevity, 20 percent in puncture resistance, and 30 percent in load capacity. Instructions Step 1 Research the business climate in 10 African countries. Step 2 Prepare an EFE Matrix for Michelin based solely on the opportunities and threats that Michelin will face in doing business in the 10 African countries you have chosen Step 3 Based on your research, list the 10 African countries you selected in rank order of attractiveness for Michelin to focus efforts upon. Give a one-sentence rationale for each country’s ranking