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 alzheimer’s doesn’t smoke any cigarettes.

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 than expected would be those who have dementia, they smoke 20 more cigarettes a day.

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

No, people who have Alzheimer’s were showed to smoke the least out of everyone. They had the largest box under none.

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)?

Hightemp and number trail users have the most positive correlation at 0.92

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

The most popular season for trail users is summer

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. They are not in a linear relationship, there is not many points near the line of best fit and they points are scattered everywhere.

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.