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Sampling and Estimation
(the average case)
Overview
• We take a simple random sample
– from a well-defined population
• The sample mean is “probably/usually” “close” to
the population mean
• By “probably/usually” we mean “in 95% of all
samples”
• By “close” we mean “within ~2 standard errors”
Populations and samples
Overview
• Defining a population
• Taking a simple random sample
• How similar is the sample to the population?
fichier-pdf.fr/2015/10/12/lecture-7-part-1/
12/10/2015
Watson2
INTRODUCTION
A popular tree of moist to wet soils, common
alder is a moderate to fast-growing (two feet per year)
deciduous tree which usually grows to 40 to 50 feet in
height with a 20 to 40-foot spread and a 12 to 18-inch
trunk but is capable of reaching 80 feet in height in
the woods (Fig.
fichier-pdf.fr/2015/04/23/alnglua/
23/04/2015
Anti-itch cream (available everywhere)
●
Comb or small brush
●
Bath towels usually provided
●
Deodorant
●
Shampoo and conditioner are not always provided everywhere/ or provided in small
●
quantities BUT there are supermarkets with all these products everywhere so you can just get
one there unless you use a very particular brand you’d like to bring with you
Toothbrush, toothpaste, &
fichier-pdf.fr/2015/03/06/kenya-july-suggested-packing-list-1/
06/03/2015
We
idenFfy
trends
that
are
usually
qualified
as
bad
taste,
amongst
the
bizarre,
the
unconven-onal,
the
sub-‐cultural,
the
eccentric,
the
trash,
the
extravagant,
the
freak
and
the
kitsch.
fichier-pdf.fr/2011/10/30/presentation/
30/10/2011