Exercises

We are given the following list:
```
lst <- list(yabba = letters,
            dabba = list(x = LETTERS,
                         y = 1:10),
            do = bcscr::m111survey)
```
One way to access the letter “b” in the first element of lst is as follows:
```
lst$yabba[2]
```
```
## [1] "b"
```
Another way is:
```
lst[[1]][2]
```
```
## [1] "b"
```
For each of the following objects, find at least two ways to access it within lst:
- the vector of letters from “c” to “j”;
- the capital letter “F”;
- the vector of numbers from 1 to 10;
- the heights of the five tallest individuals in m111survey.
Write a function called goodStats() that, when given a vector of numerical values, computes the mean, median and standard deviation of the values, and returns these values in a list. The function should take two parameters:
- x: the vector of numerical values;
- ...: the ellipses, which allow the user to pass in additional arguments.
The list returned should name each of the three quantities:
- the name of the mean should be mean;
- the name of the standard deviation should be sd;
- the name of the median should be median.
Typical examples of use should look like this:
```
vec <- 1:5
goodStats(x = vec)
```
```
## $mean
## [1] 3
## 
## $sd
## [1] 1.581139
## 
## $median
## [1] 3
```
```
vec <- c(3, 7, 9, 11, NA)
myStats <- goodStats(x = vec, na.rm = TRUE)
myStats$mean
```
```
## [1] 7.5
```