Suppose the following are the ages of a group of individuals enrolled in a study looking at the relationship between sleep apnea and Alzheimer’s disease

Suppose the following are the ages of a group of individuals enrolled in a study looking at the relationship between sleep apnea and Alzheimer’s disease.

6,  8,  4,  3,  7,  12,  9,  4,  7,  1 

?Find the following:

A) Mode and Mean

B) Median 

C) Variance

D) Standard Deviation

E) Range

F) Find the quartiles (Q1, Q2, Q3)

G) Create a stem-and-leaf plot for the distribution of ages in this study.

H) Interpret the stem-and-leaf plot with respect to the spread of the distribution.

I) Find the Interquartile

J) Create a boxplot for the data. Are there any outliers?