Myopia (IE

question 30

Multiple Choice

Myopia (i.e. ,nearsightedness) is a result of environmental and genetic factors.In Singapore,the percent of military personnel having myopia increased dramatically over a 20-year period.Based on this fact,researchers wondered if the effect of the environment might be stronger and the genetic effect much less pronounced than previously thought.To study this issue,data from a random sample of 429 men,ages nineteen to twenty-five,in the Singapore military were obtained.Among other things,the men in the study were classified as to whether or not they had myopia and whether at least one of their parents had myopia.The results are presented in the table below. What are the odds that a man with at least one parent with myopia also has myopia? (Note: Use three significant digits for the calculation. )

• A)0.590
• B)0.907
• C)1.439
• D)9.753

Understand the process of balancing chemical equations for combustion.

Distinguish between complete and incomplete combustion.

Identify products of combustion under various conditions.

Understand the concepts of oxidation numbers in chemical compounds.