Math 15 – Elementary Statistics

Chapter 10 – Part 3The Confidence Interval

(Choose your weapon, bb gun or fly swatter.)

Capture the ParameterYour mission, if you choose to accept it, is to track down and capture a fly, dead or alive.

Your choice of weapons are: 1. A bb gun, or2. A fly swatter.

Q: Which weapon choice would give you the most confidence?

The Salmon Population

• Now, Let’s be more realistic. This time we are interested in estimating the population mean average weight of King Salmon.

€

x ≈ 30.51

€

n = 33

The Point Estimate - bb

The Point Estimate - bb

€

x ≈ 30.51

The Point Estimate - bb

The Interval Estimate – fly swatter

€

x ≈ 30.51

€

s ≈ σ ≈ 8.74

Another Example