Question

Stream ecologists are interested in the number of distinct organisms found in streams and whether or not differences exist based on geography. Separate random samples are obtained from sites in Northeastern and Southeastern streams, and the number of distinct organisms is recorded. They are given as separate stemplots for Northeastern and Southeastern streams.

Northeastern Southeastern
0 0 5 5 7 8
1 5 1 1 2 3 5 9 9
2 0 3 9 2 2 7
3 1 4 7 8 8 3 3
4 4 8 8 4 1
5 5 7 5

Required:
What is the sample size obtained from Southeastern?

Answer 1

14

Explanation:

Given

See attachment for proper stem plots for both district

Required

The sample size for Southeastern

The stem plot for southeastern is:

`Stem | Leaf`

`0 | 5\ 5\ 7\ 8`

`1 | 1\ 2\ 3\ 5\ 9\ 9`

`2 |2\ 7`

`3 | 3`

`4 | 1`

`5 |`

To get the sample size, we simply count the leaves

The leaves are:

`Leaves = \{5, 5, 7, 8, 1, 2, 3, 5, 9 ,9,2,7,3,1\}`

The number of leaves is:

`n(Leaves) = 14`

Hence, the sample size is 14