Measures of Centre
If a student scores 80, 90, 70, and 100 on four tests, what is their mean score?
85
Which graph is best for showing percentages of a total
Sector Graph or Divided Bar Chart
Is "Eye Colour" an example of numerical or categorical data?
Categorical
On a line graph, what does the horizontal (x) axis usually represent?
Time (e.g., days, months, years).
In a plot, what do we call the last digit of a number?
The Leaf.
What is the median of this data set: 12, 15, 12, 16, 20
15
A bar graph is the best option to display what type of data?
Categorical
Is "Number of siblings" discrete or continuous data?
Discrete
If a line is sloping upwards from left to right, what is happening to the values?
The values are increasing (a positive trend).
What is the first step you must take with your data before drawing the plot?
Put the data in numerical order (lowest to highest).
Identify the mode in this set: 5, 2, 8, 5, 1, 8, 5, 3
5
What type of graph is best suited for continuous data, like heights of students?
Histogram
Is "Time taken to run 100m" discrete or continuous data?
Continuous (it is measured and can have decimals).
What term describes a sudden drop or spike that doesn't fit the rest of the trend?
An outlier
How would you represent the number 7 in a stem and leaf plot?
Stem: 0, Leaf: 7.
If the mean of three numbers is 10, and two of the numbers are 8 and 12, what is the third number?
10
What does the vertical axis (y-axis) usually represent on a column graph?
Frequency
Give an example of nominal categorical data (data with no natural order).
Favourite colour or Pet type (Ordinal data, like "Small/Medium/Large," has an order; Nominal does not)
If a line graph shows temperature over 24 hours, how do you find the hottest time?
Look for the highest point (peak) on the vertical axis and check the corresponding time below.
Create an stem & leaf plot for 22, 11, 25, 29, 14, 8, 41, 18
0 | 8
1 | 1, 4, 8
2 | 2, 5, 9
3 |
4 | 1
Explain why the median is sometimes better than the mean, using the data: 1, 2, 2, 3, 50
50 is an outlier
What is the difference between a bar graph and a histogram when displaying numerical data?
bar graph is for discrete numerical data
histogram is for continuous numerical data
Which data type is measured using a scale (like cm or kg) rather than counted?
Continuous Numerical data.
Why is a line graph better than a column graph for showing changes over time?
It shows the connection between points, making it easier to see trends, patterns, and rates of change.
"Explain why including a 'key' (for example, 2|5 = 25) is an essential part of a stem and leaf plot. What could happen if it is missing?
Without a key, the reader won't know the place value (e.g., 2|5 could mean 25, 2.5, or 250).