The flashcards below were created by user
Anonymous
on FreezingBlue Flashcards.
-
-
Quantitative data is:
Numerical eg. age:measured in years
-
Qualitative data is:
Grouped/ Categorical eg. Preferred accomodation type (Budget, Tourist, Superior)
-
Categorical data (Qualitative) is:
- Nominal (name or number given to a category as a label)
- Ordinal (name or number implies ranking)
-
Numerical data (Quantitative) is:
- Discrete (whole or counting numbers)
- Continuous (infinite number of values eg. Age, Income)
-
A population is the :
Whole collection of things under consideration
-
A sample is a:
Portion of the poplulation selected for analysis
-
A parameter is a:
Summary measure that describes the characteristic of the population
-
A statisitic is a:
Summary measure computed that describes a characteristic of a sample.
-
Sources of data:
- Primary data
- Secondary data
- Census
- Experimental data
- Surveys
-
Non sampling errors:
- Coverage error
- Non response error
- Measurement error
-
Sampling error:
Chance differs from sample to sample
-
Measures of central tendancy:
- Mean (Average)
- Median (Middle value)
- Mode
- Trimmed Mean (cuts out extreme 5%)
-
Measures of spread:
- Range (Max - Min)
- Interquartile range (middle 50%)
- Varience (std dev around the mean)
- Std Deviation (square root of the varience)
-
Measures of shape: Skewness
- Symmetric distribution (median = mean)
- Right skewed (Tail to the right)
- Left skewed (Tail to the left)
-
Measures of shape: Kurtosis
- Positive Kurtosis: Data clusters more and have longer tails
- Negative Kurtosis: Data is less clustered and has shorter/ fatter tails
-
Box and whisker plots:
- Box (shows interquartile range)
- Line (median)
- Whiskers (highest and lowest value)
- Outliers
- Extreme outliers
|
|