---
title: "Stat 140 Experiments and Observational Studies"
author: "Evan Ray"
date: "October 6, 2017"
output:
  pdf_document:
    fig_height: 2.8
    fig_width: 6
  html_document:
    fig_height: 3
    fig_width: 5
  word_document:
    fig_height: 3
    fig_width: 5
---


```{r include=FALSE}
# Don't delete this chunk if you are using the mosaic package
# This loads the mosaic and dplyr packages
require(mosaic)
require(readr)
require(ggplot2)
require(dplyr)
```

```{r include=FALSE}
# Some customization.  You can alter or delete as desired (if you know what you are doing).

# knitr settings to control how R chunks work.
require(knitr)
opts_chunk$set(
  tidy=FALSE,     # display code as typed
  size="small"    # slightly smaller font for code
)
```


## Abstract 1

After reading the abstract of "Meditation or Exercise for Preventing Acute Respiratory Infection: A Randomized Controlled Trial", answer the following questions:

#### 1. Is this an observational study or an experiment?

\vspace{2.5cm}

#### 2. What are the explanatory and response variables?

\vspace{2.5cm}

#### 3. In what way was randomization used in the study?

\vspace{2.5cm}

#### 4. What were the treatments used in the study?

\vspace{2.5cm}

#### 5. What sources of bias might be present?

\vspace{2.5cm}

#### 6. Was there any evidence of blinding?

\vspace{2.5cm}

#### 7. What did the study conclude?

## Abstract 2

After reading the abstract of "Association of Coffee Drinking with Total and Cause-Specific Mortality", answer the following questions:

#### 1. Is this an observational study or an experiment?

\vspace{2.5cm}

#### 2. Is the study prospective or retrospective?

\vspace{2.5cm}

#### 3. What are the explanatory and response variables?

\vspace{2.5cm}

#### 4. How did the authors adjust for possible sources of confounding?

\vspace{2.5cm}

#### 5. What did the study conclude?
