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 group of non-smokers are the largest that has Alzheimer’s, 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 smoked 10- 20 cigarettes a day.

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

There is no direct correllation between smoking cigarettes and getting Alzheimer’s Disease.

Q4 Create correlation plot for RailTrail.

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

They are high temperature, average temperature, low teperature, and summer time.

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

The most popular season seems to be the summertime.

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?

No correllation between high temperature and cloud cover. the scatterplot was scattered.

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.