×
Get Full Access to U of T - STA 304 - Class Notes - Week 1
Get Full Access to U of T - STA 304 - Class Notes - Week 1

×

U OF T / Statistics / STA 304 / What is a partial investigation of the finite population using samples

What is a partial investigation of the finite population using samples Description

Description: WEEK ONE class slides for summer 2017
60 Pages 434 Views 0 Unlocks
Reviews

STA304 H1 S/1003 H S

Summer 2017

Dragan Banjevic

Introduction into basic ideas (I)

Note: A lot of material is used from the Internet, some with reference, some without.

1) Sample Survey is a partial investigation of the finite population using a sample. The purpose of the sample survey is to obtain information about the population.

• The households in a city and their spending patterns
• The business enterprises in an industry and their profits
• The individuals individuals in a country country and their participation participation in the workforce
• The farms in a region and their production of cereal
• Amount of mineral or fossil-fuel resources at new site
• Prevalence of a rare disease
• Introduction Into Basic Ideas (II)

2) Population is a group of units defined according to the aims and objectives of the survey.

Examples of populations:

• All the fields under a specified crop (in an area and yield surveys)
• All the h h ld household having four or more children (in socio‐ economic surveys)
• 3) Sampling is the selection of part of the population (selection of units from the population).If you want to learn more check out Determine which cps are mins or maxes?

4) Sampling Method is a scientific and objective procedure of selecting units from a population. It provides a sample that is expected to be representative of the population as a whole. It also provides procedures for estimation of the population parameters.

Example (Nutr J. 2007; 6: 35): A survey of energy drink consumption patterns among college students ( 1 )

The purpose: To determine energy drink consumption patterns among college students (prevalence and frequency) for six Don't forget about the age old question of canvas uthscsa login

Situations:

• insufficient sleep
• increase energy(in general)
• studying, or major project
• driving long periods of time
• mixing with alcohol alcohol while partying
• treat a hangover
• and prevalence of adverse side effects and energy drink use dose effects among college energy drink users

“Hangover Hangover cure, try cracking a fresh egg into a small glass, add some Hot sauce (Tapatio works for me) , fresh cut lime juice, maybe a small pinch of salt, and down it. I have tried it, and it helped.”  ‐ an advice, not from me

Example: Energy drink consumption (II)

Methods: Responses to 19 item survey from 496 randomly surveyed college students attending a state university in the Central Central Atlantic Atlantic region of the United States.

Some Results

Energy drink user (more than one energy drink each month for the current semester ): 51% Users consumed energy drinks for:

• Insufficient sleep (67%)
• Increasing energy (65%)
• Drinking with alcohol while partying (54%)
• Experienced weekly jolt and crash episodes (29%) We also discuss several other topics like sakai brocku

Conclusions: … side effects from consuming energy drinks are fairly common, … Future research should identify …

Review Of Basic Notions From Statistics (I)

Population: Set (group) of elements (units) of our interest

Units: Elements of the population

Variable, Measurement, Characteristic, Property: Function defined on population elements, characteristic of population elements.

Variable can be – quantitative (numerical) or qualitative (categorical).

Variable Range: Set of variable values, i.e. all values the variable can take.

Example

Population:

STA304 Summer’ 2013 class

Variables of interest:

height, weight, sex, …

If you want to learn more check out Is denial an initial response to drug abusers?
We also discuss several other topics like uthscsa canvas
If you want to learn more check out What refers to the maximum amount of solute that can be dissolved in a given amount of solvent?

Review Of Basic Notions From Statistics (II)

Notation

Population: E = {e1, e2, e3, ... , eN}         Population size: N

Elements e, e                                 Variables: y x z t i Variables: y, x, z, t, …

Range: {y(e) : e E}                                 e → y(e), x(e), …

Distribution, frequency distribution: Proportion/percentage of elements with value in an interval [a,b], for any a and b

Discrete variable:        Prop()

Continuous variable: Prop (a,b) = Prop(a<y≤b) =

density function

Page Expired
It looks like your free minutes have expired! Lucky for you we have all the content you need, just sign up here
References: