wk 1 Flashcards

PREPARATION FOR EXAM

1
Q

what is a sampling error and the equation

A

the difference between a characteristic’s value in the population parameter and its value in a sample statistic from that population.
Sampling Error = Parameter - Statistic

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2
Q

define parameter and statistic

A

parameter - a descriptive measure from
the population
statistic -a descriptive measure from
a sample

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3
Q

name and define the 2 types of qualitative data
provide examples

A

nominal,- used to categorise data( gender, hair colour )
ordinal- indicates rank or order (review scale)

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4
Q

name and define the 2 types of quantitative data
provide examples

A

discrete - data that we collect that can be counted and that only has a certain number of values (people in a class, test questions answered correctly)
continuous - Continuous data is data that can take any value. (Height, weight, temperature and length)

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5
Q

what is interval level data?
examples

A

Data are always numerical and distances between consecutive integers have meaning
Differences between numbers are equal
The location of zero is a matter of convenience or convention and not a natural or fixed data point
Example: Calendar time

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6
Q

how is ratio level data different to interval?

A

same properties as interval data, with the
additional property that zero has a meaning and represents the absence of the phenomenon being measured. The ratio of two values is also meaningful

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7
Q

what is random sampling and what are the 4 types

A

Subjects of the sample are chosen randomly from the population with a known probability.
 Four types: SRS, systematic, stratified and cluster

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8
Q

define Simple Random Sample (SRS)

A

Every individual or item from the sampling frame* has an equal chance of being selected
*sampling frame = listing of population

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9
Q

define Systematic Sampling

A

a systematic sample is chosen from an ordered list of the population, with the starting point chosen randomly and each successive sample member selected systematically.

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10
Q

explain how to conduct systematic sampling

A

Define sampling frame = listing of population N
* Decide on sample size (n) and calculate k:
k = N/n
* Randomly select a starting point between 1 and k
* Select every kth individual after that

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11
Q

name the sampling method that involves dividing the population into two or more strata according to some common characteristic

A

stratified sampling

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12
Q

how do you conduct

A
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