EXAMPLE 23 Notation used for the runs test for randomness
The following sequence represents the genders of 20 students in a statistics class recorded as they enter the classroom:
| F | F | M | M | M | F | F | F | M | F | F | F | M | M | F | F | M | F | F | M |
Calculate the values of , , , and .
Solution
There are females and males, so that . There are runs.
NOW YOU CAN DO
Exercises 5–8.