The Dental Health Awareness of Nursing Staff in Singapore

Assignment Task

Question

1. Dental health in Singapore

Staff at Singapore Dental Hospital carried out a study to examine the dental health of 5-year-old children living in Singapore. Each of 360 children had a dental examination under standard conditions and the number of decayed, missing and filled teeth was recorded. Also recorded were the sex of the child, whether they were currently registered at a dentist and the deprivation category of the area (postcode sector, such as S12 8, or S25 7) the child lived in. The researchers’ question of interest was whether 5-year-old children living in deprived areas have worse oral health than 5-year-old children living in more affluent areas.

You have been given a subset of 100 of these children in the dataset. The data is stored as comma-separated values.

a) Using either Minitab or SPSS, obtain appropriate descriptive statistics and suitable plots for the variables Sex, DepCat, RegCat, and DFMT individually (i.e. do not look at any relationships between these variables). Provide a short interpretation of the output you produce for each variable.

b) Using either Minitab or SPSS carry out a 2-sample t-test and confidence interval to investigate whether there is a difference between oral health, as measured by DFMT, in the poorest areas (DepCat 7) and in less deprived areas.

2. State the assumptions of regression that can be assessed using residual plots. For each of these, state which residual plot or plots are useful for assessing the assumption and describe how the assumption can be checked, giving brief details of what should be looked for in each plot.

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