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23 Cards in this Set
- Front
- Back
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Define population? |
A population consists of all the members of a group about which you want to draw a conclusion |
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define sample? |
A sample is the portion of the population selected for analysis |
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define parameter? |
A parameter is a numerical measure that describes a characteristic of a population |
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Define statistic? |
A statistic is a numerical measure that describes a characteristic of a sample |
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Greek letters (μ, σ, Ν) are used for Roman letter (x, s, n) are used for |
= population data = sample data |
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Descriptive statistics = |
1. collect data 2. present data 3. characterise |
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Inferential statistics |
Drawing conclusions about a population based on sample data i.e. estimating a parameter based on a statistic Estimatione.g. Estimate the population mean weight (parameter) using the sample mean weight (statistic) Hypothesis testinge.g. Test the claim that the population mean weight is 100 kilos |
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Categorical (qualitative data) = |
Quantitative data are measures of values or counts and are expressed as numbers.Quantitative data are data about numeric variables (e.g. how many; how much; or how often). Qualitative data are measures of 'types' and may be represented by a name, symbol, or a number code.Qualitative data are data about categorical variables (e.g. what type). |
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Quantitative ( numerical) = |
Quantitative data are measures of values or counts and are expressed as numbers.Quantitative data are data about numeric variables (e.g. how many; how much; or how often). |
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Nominal data = |
Nominal scales are used for labeling variables, without any quantitative value. “Nominal” scales could simply be called “labels.” eg. gender, political belief |
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ordinal data = |
With ordinal scales, it is the order of the values is what’s important and significant, but the differences between each one is not really known eg. not good, great, amazing in survey. |
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continous data = |
Data that can take any value (within a range) |
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discrete data = |
Data that can only take certain values. |
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time series data = |
collected throughout time |
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cross sectional data = |
point in time |
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What do you use to chart numerical data? |
1. ordered array 2. freq. distribution table 3. cumulative distribution table 4. histogram |
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what is a frequency distribution table? |
A summary table in which data is ordered into classes or intervals. Used to condense raw data. |
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How do you determine width of interval? |
width = range / no. desired grouping |
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what are scatter diagrams? |
They are diagrams used to examine possible relationships between two possible numerical variables? |
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what is a time series plot? |
Used to study patterns in values of a variable over time. |
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arithmetic mean formula= |
sum of values / no. of values |
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formula for median? |
n + 1/ 2 |
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How do you find the quartile positions for Q1. Q2 & Q3? |
Q1= (n + 1) / 4 Q2 = (n + 1) / 2 Q3= 3 ( n + 1) / 4 |
