Sampling Logic
11 important questions on Sampling Logic
What is the difference between a histogram and a bar chart?
Histogram when the measurement level is interval or ratio
Bar chart when the measurement level is dichotomy, nominal, ordinal
What does a frequency table consist?
- Title
- Variables
- values
- units
- total
- frequencies
- precentages
Where are the units and variables stand in a datamatrix?
Variables in the columns
Variables Have Names and Labels
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How does a Pie chart looks like and what are the advantages and disadvantages?
Advantage: You can see immediately that a X percentage of the observation comes from ..... That is harder to see in a bar chart.
Disadvantage: The exact number is not easily retreat from a pie chart
When do you use a bar chart in stead of a pie chart?
What is a histogram?
The big difference is that the bars in the histogram touch each other. That means that there is an underlying scale.
It is important that the interval is alway’s the same but does not have to start at zero.
How do you find the mode and with what measurement level do you use the mode?
Often used if a variable is measured on a nominal or ordinal level
When should you use the mean, mode or median?
When it is quantitative, you can calculate the mean and median
What is the interquartile range?
This gives an indication about how the data is spread.
What is the advantage of Variance or standard deviation in comparison to a box-plot?
What are the characterstics of a normal curve?
- Symmetric
- single peak
- bell shaped
- completely described by the mean and deviation
- mean & median are on the same point in the middle
The question on the page originate from the summary of the following study material:
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