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 graph says smoking has little to no affect for people who have or may get alzheimers

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

people with other demetians that smoke 20 or more cigaretts a day are one group that has more cases.

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

Somking doesnt seem to have an affect when it comes to determining alzheimers.

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 positive correlations are volume, hightemp,avgtemp, and summer. all of these are psoitive so they work.

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

summer is the most popular because of its corralation of 0.23 and fall has a negative corralation of -0.25 making it less popular

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.

cloud cover and high temp have a very small correlation showing that the two have very little affect on eachother and the two have little to no relationship with eachother

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.