(5 pts)

Using your Discourse login name, load some data into a data from like so:

```
df = read.csv("https://www.marksmath.org/cgi-bin/random_data.csv?username=mark")
head(df)
# first_name last_name age gender height weight income smoke100 exerany handedness
# 1 Donna Dinan 35 female 65.37 164.26 1947 N Y R
# 2 Ramon Davis 20 male 66.59 139.53 22747 Y Y R
# 3 Mark Buss 23 male 74.58 124.21 15489 N Y R
# 4 Lidia Elmore 52 female 63.87 153.64 8369 N Y R
```

- Use this data to find a 95% confidence interval for the proportion of people who are left handed.
- Supposedly, about 12% of the population is left-handed. Use this data to perform a hypothesis test of that statement.

I guess your confidence interval should look like this: [0.0268, 0.1332].