- Q1 Describe the largest group that has other dementias. Discuss it by number of cigarettes per day.
- Q2 Describe one group that has more cases than expected given independence (by chance). Discuss it by number of cigarettes per day.
- Q3 Does smoking seem to matter in determining other dementias? Discuss your reason using the masaic chart above.
- Q4 Create correlation plot for
`RailTrail`

. - Q5 List all four variables that have negative correlation with the number of trail users (volume).
- Q7.a Continued from Q7. Create scatter plot. After examing the scatter plot, would you conclude that the two variables are not related at all?
- Q8 Hide the messages, the code and its results on the webpage.
- Q9 Display the title and your name correctly at the top of the webpage.
- Q10 Use the correct slug.

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”.

People that are not smoking cigarettes have the largest group. 0 cigarettes per day.

Other dimentias greater than 20 cigarettes a day.

Smoking does not matter in determining dementias. There is only small reltionships.

`RailTrail`

.Hint: The `RailTrail`

data set is from the `mosaicData`

package. ``

Fall(-.25), Spring (-.04), Cloudcover(-.37), Percipitation (-.23) all have a negative correlation. ## Q6 What season seems to be least popular for trail users? Fall is the least popular season for trail users. ## Q7 The correlation coefficient between `hightemp`

and `cloudcover`

is quite small. Would you be sure that the two variables are not related at all? Hint: One word answer (e.g., yes or no) is NOT enough. Explain why.

No, the correlation between high temp and cloud coverage is very small. The correlation is (-0.1)

Hint: Use `message`

, `echo`

and `results`

in the chunk options. Refer to the RMarkdown Reference Guide.