Data Tabulation
What is the purpose of a frequency table?
To show how often each category or value occurs
Which type of graph is best for showing parts of a whole?
Pie chart
Which measure identifies the most frequently occurring value?
Mode
Is “favourite colour” categorical or numerical?
Categorical
What is a variable?
A characteristic that can take different values
What does a relative frequency represent?
The proportion or percentage of the total for each category
Which graph is best for showing the relationship between two numerical variables?
Scatterplot
What does the mean represent?
The average value of a dataset
Why can categorical data not be averaged?
Because categories are labels, not numerical values
What is a dataset?
A collection of related data values
Why do we group data into classes or intervals?
To organize large sets of numerical data into meaningful ranges
Which graph is best for showing changes over time?
Line graph or time series
What does the median represent?
The middle value when data is ordered
What is an outlier?
A value that is much higher or lower than the rest of the data
What is a distribution?
The pattern of how data values are spread out
What is the difference between raw data and summarized data?
Raw data is unprocessed; summarized data is organized into tables or categories
What type of graph is used to display grouped numerical data?
Histogram
Why can the mean be misleading in skewed data?
Because extreme values pull the mean in one direction
How can outliers affect a dataset?
They can distort the mean and change the interpretation
What is a numerical variable?
A variable measured with numbers
Why is consistency important when creating categories in a table?
To ensure accurate comparison and interpretation
Why might a bar graph be better than a pie chart?
It makes comparisons between categories easier to see
When is the median a better measure than the mean?
When the data contains outliers or is skewed
Why is it important to check for data entry errors?
Because incorrect values can lead to wrong conclusions
What is a categorical variable?
A variable that describes groups or categories