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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
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x ≈ 30.51
The Point Estimate - bb
The Interval Estimate – fly swatter
€
x ≈ 30.51
€
s ≈ σ ≈ 8.74
Another Example