Quiz3

The data set is from a case-control study of smoking and Alzheimer’s disease. The data set has two variables of main interest:

• smoking a factor with four levels “None”, “<10”, “10-20”, and “>20” (cigarettes per day)
• disease a factor with three levels “Alzheimer”, “Other dementias”, and “Other diagnoses”.

Q1 Describe the largest group that has Alzheimer. Discuss it by number of cigarettes per day.

The largest group that has alzheimers is the group that does not smoke. They smoke 0 cigarettes a day.

Q2 Describe one group that has more cases than expected given independence (by chance). Discuss it by number of cigarettes per day.

The group that has more cases is the dementias group from looking at the data. They smoke 20 or more cigarettes a day.

Q3 Does smoking seem to matter in determining Alzheimer? Discuss your reason using the masaic chart above.

It does not look like smoking determines alzheimers because looking at the chart, people that do not smoke have the most people getting alzheimers and the people that smoke any cigarettes from any amount look like they do not get alzhimers in as big of a margin as the none smoking.

Q4 Create correlation plot for RailTrail.

Hint: The RailTrail data set is from the mosaicData package.

Q5 What variables have positve correlation with the number of trail users (volume)?

The variables that have a positive correlation with the number of trail users is the hightemp which has the highest correlation, also, avgtemp, lowtemp, and summer have positive correlations with volume.

Q6 What season seems to be most popular for trail users?

The season that is the most popular for trail users is the summer from looking at the chart.

Q7 The correlation coefficient between hightemp and cloudcover is quite small. Would you be sure that the two variables are not related at all? Create scatter plot. After examing the scatter plot, would you conclude that the two variables are not related at all?

Hint: Discuss your reason by explaining your scatter plot.

There is no correlation between the two variables as the scatter plot shows they are all over and they are not related at all from looking at the chart.

Q8 Hide the messages, the code and its results on the webpage.

Hint: Use message, echo and results in the chunk options. Refer to the RMarkdown Reference Guide.

Q9 Display the title and your name correctly at the top of the webpage.

Q10 Use the correct slug.