Stat 200
Homework 1 Solutions
1.4 Use R as you would a calculator to find numeric answers to the following:
1. 1 + 2(3 + 4)
2. 4
3
+ 3
2+1
3.
(4 +3)(2 +1)
4.
1+2
3+4
2
Solutions
1. > 1 + 2 * (3 + 4)
[1] 15
2. > 4^3 + 3^(2+1)
[1] 91
3. > sqrt((4+3)*(2+1))
[1] 4.582576
4. > ((1+2) / (3+4))^2
[1] 0.1836735
1.9
The asking price of unused MINI Coopers varies from seller to seller. An online
classifieds listing has these values in thousands:
15.9 21.4 19.9 21.9 20.0 16.5 17.9 17.5
1. What is the smallest amount? The largest?
2. Find the average amount.
3. Find the differences of the largest and smallest amounts from the mean.
Enter in the data and apply one of R’s functions to find answers to the above questions.
Solutions
> cooper <- c(15.9,21.4,19.9,21.9,20.0,16.5,17.9,17.5)
1. > range(cooper)
[1] 15.9 21.9
2. > mean(cooper)
[1] 18.875
3. > range(cooper) - mean(cooper)
[1] -2.975 3.025
1.12
Create the following sequences:
1. “a”, “a”, “a”, “a”, “a”
2. 1, 3, …, 99 (the odd numbers in [1,100])
