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 other dementias. Discuss it by number of cigarettes per day.

The largest group that has other dementias are the non-smokers that smoke zero 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.

The group that has more cases than expected given by chance are those who smoke more tha 20 cigarrettes a day.

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

Smoking does not seem to matter in dtermining other dementias, this can be seen with the masaic chart because the biggest group the has other dementia’s is also the group the smokes zero cigarettes a day.

Q4 Create correlation plot for RailTrail.

Hint: The RailTrail data set is from the mosaicData package.

Q5 List all four variables that have negative correlation with the number of trail users (volume).

All four variables that have negative correlation are precipitation, cloud cover, spring and fall.

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

According to the data fall has the largest negative correlation compared to the other variables, this makes it seem like 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 you could no be sure if the two variables are not related at all, the hightemp and cloudcover is small but the color where they meet is white which indicates theres no correlation at all and how close to 0 it is.

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?

Hint: Discuss your reason by explaining your scatter plot.

The relationship shown from the scatter plot shows that there is no true relationship between the two variables, this means that there is no definied relationship between them.

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.