Measures of Central Tendency
Find the mean: 5, 10, 15
10
Is favourite pizza topping qualitative or quantitative?
Qualitative
If 40% of students said Yes and 25 students were surveyed, how many said Yes?
10
What type of graph shows the relationship between two numerical variables?
Scatter plot
Primary data means…
Data you collect yourself
Find the median: 3, 8, 12, 20
10
Is height quantitative discrete or continuous?
Quantitative Continuous
Convert 32% of 25 students into a number.
8
If as X increases, Y decreases, this is a ______ relationship.
Negative
Secondary data means…
Data collected by someone else
Find the mode: 4, 7, 7, 9, 10, 10, 7
7
Would you use a bar graph or scatter plot for favourite sports?
Bar graph
What formula do you use to find relative frequency?
Category total ÷ Overall total × 100
What is an outlier?
A data point far from the rest that doesn’t fit the pattern
What is bias in data collection?
When the sample does not fairly represent the population
Which measure of central tendency is MOST affected by an outlier?
The Mean
Give one example of data that would require a scatter plot.
Answer example: Hours studied vs test score
A graph starts its y-axis at 50 instead of 0. What is this called?
Misleading / distorted graph
What goes in the first column of a table of values: independent or dependent variable?
Independent variable
Which graph is best for showing change over time?
Line graph
Data: 10, 12, 14, 16, 100
a) Identify the outlier
b) Which measure best represents this data?
100 & median
Is number of siblings qualitative, quantitative discrete, or quantitative continuous?
Quantitative Discrete
Why is a 3D pie chart sometimes misleading?
It exaggerates slice size / distorts visual perception
Describe the strength of a relationship when points closely follow a line.
Strong relationship
You notice sales increase every month in a steady pattern. What is this called?
A trend