STAT 245: Assignment 1 (Frequency and Stem-Leaf)
1. In the following study, 20 manuscripts of an unknown author were found. Some of the evidence proved that
these unknown manuscripts were either written by author A or author B. To decide between these two
Stats 245 Assignment 2 - Solutions
For each of the three drugs A, B and C
a) Compute the mean and the standard deviation.
Drug A
n
x=
x
i =1
i
n
=
209.2
= 10.46 , s =
20
n
xi
n
2
xi i =1
2
2431.72 (209.2 )
2
n
i =1
n 1
=
20 = 3.58
19
Drug B
n
x=
x
i