Please answer 16.3 only. And please explain the steps for understanding. If a language is used please use R.

Thanks!

16.2. 16.3. A market researcher, having collected data on breakfast cereal expenditures by families with l. 2. 3. 4. and 5 children living at home, plans to use an ordinary regression model to estimate the mean expenditures at each of these ve family size levels. However; the researcher is undecided between tting a linear or a quadratic regression model, and the data do not give clear evidence in favor ot'one model or the other. A colleague suggests: \"For your purposes you might simply use an ANOVA model." Is this a useful suggestion? Explain. In a study of intentions to get uvaccine shots in an area threatened by an epidemiC, 90 13615\" were classied into three groups of 30 according to the degree of risk of getting flu. Each group was together when the persons were asked about the likelihood of getting the shots. on a probability scale ranging from U to ID. Unavoidably, most persons overheard the answers of nearby respondents. An analyst wishes to test whether the mean intent scores are the same for the three risk groups. Consider each assumption for ANOVA model (16.2) and BXPlai" whether this assumption is likely to hold in the present situation