Problem 6. An individual is said to be anemic (or have anemia) if they do not have enough healthy red blood cells to transport oxygen to tissues in the body. According to the US National Heart, Lung and Blood Institute, anemia affects approximately 3 million Americans and is the most common blood disorder in the United States. Anemia can have many causes, including internal bleeding or nutri- tional deciencies. Anemia is diagnosed by measuring the level of hemoglobin present in blood; hemoglobin is the protein in red blood cells responsible for oxygen transport. Loss of energy and easy fatigue are common symptoms of anemia. Individuals with mild ane- mia may not recognize their symptoms. Detection of anemia typically occurs if a physician no- tices a change in energy level and requests a blood test, or if a routine blood test indicates low hemoglobin level. Anemia can be particularly serious in infants and young children, causing impairments in mental, physical, and social development. Anemia is considered a severe public health concern, especially in underresourced parts of the world where individuals have limited access to healthcare. In this problem, you will examine data from a study examining the health status of 120 children living in a slum area of a large city in Southeast Asia. The aim of the study was to estimate the prevalence of anemia and investigate possible predictors of anemia. For children in the age range of this study, hemoglobin level less than 10.5 g/dL constitutes a diagnosis of anemia. For low-income children in this age range in the United States, the prevalence of anemia is approximately 15%. The study collected demographic information in addition to measuring health variables. Family income level was recorded as wealth quintile within the sample; for example, a value of 1 for the wealth variable indicates that the child's family income level was in the lowest 20% for families with children participating in the study. Iron level was recorded via an assay in which negative values indicate iron deciency and positive values indicate adequate iron level. Data from the study are in the file anemia. Rdata. The following table provides a list of the vari- ables in the dataset and their descriptions. Variable Description sex sex, coded female for female and male for male wealth relative measure of family income level diarrhea coded Yes for at least one episode of diarrhea in the past two weeks, and No otherwise whz standardized weight-forheight z-score relative to the national population age age in months i ran blood iron level, in milligrams per kilogram (mg/ kg) hb blood hemoglobin level, in grams per deciliter (g/dL) Use the data to answer the following questions