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 smoked no cigarettes a day. The bar depicting the none smokers is longer and wider than all the other bars in the alzheimers category.

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

The group of people who have dementia, who smoke 20 or more had more cases than expecte. They had the strongest corloation with a dark blue shading.

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

No it doesnt. Sense there is just a larger population of people that dont smoke, as oposed to those that do, so there are more people who didnt smoke that got alzeihers, making it hard to see a colrolation between smoking and alzeihmers.

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)?

High tempature, average tempature, low tempature and summer all have a possitive corelation with volume. they have a positive number associated aswell as a redish or dark red shading in the plot.

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

The most popular season for trail users would be 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.

There is a linear corolation between the two varibles.

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.