CHAPTER 1 Flashcards

1
Q

what is quantitative data?

A
  • numerical observations or measurements
  • can be continuous or discrete
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2
Q

what is qualitative data?

A
  • non- numerical observations
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3
Q

what is continuous data?

A
  • can take any value on a continuous numerical scale, e.g. height
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4
Q

what is discrete data?

A
  • can only take particular values on a continuous numerical scale
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5
Q

what is categorical data?

A
  • data that can non- overlapping categories
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6
Q

what is ordinal data?

A
  • data which can be written in order and given a numerical rating scale
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7
Q

what is bivariate data?

A
  • involves pairs of related data
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8
Q

what is multivariate data?

A
  • involves sets of three or more related data values
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9
Q

what is primary data?

A
  • data collected firsthand
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10
Q

what is secondary data?

A
  • data which someone else has collected
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11
Q

what is a population?

A
  • everything or everybody that could possibly be involved in an investigation
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12
Q

what is a census?

A
  • a survey or investigation with data taken from every member of a population
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13
Q

when is a sample biased?

A
  • when it is not representative of the entire population
  • a sample which is collected unfairly or is too small can count as bias
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14
Q

what is the sampling unit?

A
  • the people or items that are going to be sampled
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15
Q

what is the sampling frame?

A
  • a list of all the sampling units
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16
Q

what is the Peterson capture- re capture formula?

A

N= Mn/m
- N= population
- M= members of population
- n= sample size
- m= number marked

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17
Q

what assumptions are made in the Peterson capture- recapture formula?

A
  • the population has not changed (no births or deaths)
  • the probability of being caught is equal for all of the individuals
  • marks or tags are not lost/ washed off and are always recognisable
  • the sample size is large enough to be representative of the population
18
Q

what is a random sample?

A
  • everyone in the population has an equal chance of being chosen
  • unbiased and representative of the entire population
19
Q

what is judgement sampling?

A
  • using you judgement to select a sample which is representative of the population
20
Q

what is opportunity sampling?

A
  • using the people or objects which are available at the time to conduct a sample
21
Q

what is cluster sampling?

A
  • when the data naturally splits into groups. e.g. geographical areas
  • the list of clusters is the sampling frame, some clusters are randomly selected from it to make the sample
22
Q

what is systematic sampling?

A
  • take a starting point from the sampling frame at random, then choose items at regular intervals
  • for example, every 10th person on a list
23
Q

what is quota sampling?

A
  • group the population by characteristics such as age/ gender and interview a quota number from each group e.g. 10 males over 25, 15 females aged 35-60
24
Q

what is a stratified sample?

A
  • contains members of each stratum in proportion to the size of that stratum, the sample from each stratum is selected randomly
25
stratified sample equation?
(amount of students in stratum/ total population) x sample size
26
what does repeating an experiment and coming out wit the same result show you?
- the data is likely to be valid and reliable
27
what is a questionnaire?
- a set of questions designed to obtain data
28
what is the person completing a questionnaire called?
- the respondent
29
what is an open question?
- has no suggested answers
30
what is a closed question?
- has a set of given answers to chose from
31
issues with an open question?
- every respondent could give a different answer, so it can be difficult to summarise and analyse the answers
32
what to include in questionnaires?
- questions with short and simple language - avoid biased questions - ensure intervals do not overlap - ensure it includes all possible answers - include time frame - avoid questions which respondents are unlikely to answer honestly
33
what is a pilot survey?
- a survey conducted on a small sample to test the design, method and reliability of that survey
34
what is an outlier or anomalous data value?
- value which does not fit the pattern of the data - you can ignore the outlier if it is due to a measuring or recording error
35
what is a random response method?
- uses a random event to decide how to answer the question
36
what is cleaning data?
- identifying and either correcting or removing inaccurate data values (caused by recording or other errors) or extreme values - removing units or other symbols from data - deciding what to do about missing data
37
what is an extraneous variable?
- variables which you are not interested in but could affect the result of your experiment
38
what is a control group?
- tests the effectiveness of a treatment - use random selection to select two groups of people - give the test group the treatment and the control group no treatment - compare the results of the two groups to see how effective the treatment is
39
what is a matched pair test?
- where two groups of people are used to test the effects of a particular factor - 2 individuals with everything in common are paired up, except the thing being tested
40
what is a hypothesis?
- an idea that can be tested by collecting and analysing data