# What is (are) the difference(s) between a simple linear regression and a multiple regression? (2 points)

HCA 383 Biostats Lab Assignment 4

Please answer the following short answer questions.  Please cite all the sources of your information using APA format. This assignment is due Sunday, April 22nd, 2018 at 11:59 pm.

1. In statistical terms, what is the difference between a case and a variable? (2 points).

2. Distinguish between continuous and categorical variables (2 points)?

3. When patients arrive at a healthcare facility for care, continuous data as well as categorical data are collected from each patient.

a) What are four examples of data that are collected from patients?

b) Indicate whether or not the information collected is continuous or categorical.

 a) Examples of data collected from patients b) Indicate whether these data are continuous or categorical data 1. 2. 3. 4.

c) Briefly explain why in addition to listening to the patient’s complaint of why they are attending the clinic or hospital, why gathering different types of data on the patient is important to the overall patient outcomes. Give an example to explain your answer.

4. What is the researcher looking for when he or she conducts a Pearson correlation? What does a correlation of 1 (one) mean? What does a correlation of 0 (zero) mean? And what are positive and negative correlations (6 points)?

5. In research and statistics we often hear about one factor being associated or correlated with another factor or health outcome (e.g. overweight and obesity is associated with Type 2 diabetes). We also hear about independent and dependent variables.

a) What is the relationship between the dependent and the independent variable(s)? (2 points)

b) What is (are) the difference(s) between a simple linear regression and a multiple regression? (2 points)

6. It is reported that access to fluoridated water and fluoride toothpaste is correlated with decreased number of dental caries in children. In addition to just having access to these two commodities, what are three other variables or factors that you think might be associated with the decrease in dental caries? Find and cite at least one research study that addresses this issue. (5 points) This question is a short answer essay please write at least 250 words.

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