Statistical Questions
Survey, Observation, Measurement
If you wanted to be able to read a graph quickly, which graph would you choose to display data?
Bar Graph
What is the scale of a dot plot?
Which graph represents data with pictures/symbols?
What is an example of a survey statistical question?
E.g. (something you ask someone about themselves)
What is your favourite pizza?
Who is your favourite NHL player?
When we make dot plots, what should we do when we are drawing in our dots? Where should they be placed?
a. With equal-sized spaces in between them.
b. Lined up with the dots on either side of it (i.e. if you were to draw a line across all categories, the dots would line up).
c. Both a and b
c. Both a and b
Where do we find the scale on both a pictograph and a bar graph?
Pictograph - the key
Bar Graph - the y-axis (numbered axis)
What fruit is the most popular at the grocery store if 20 people bought apples, 12 people bought bananas and 26 people bought oranges?
Oranges because it has the largest dumber of votes.
What are the three rules of making a good statistical question?
1. Keywords (how many, what, who is, which).
2. Has to have a group of answers.
3. Must be answerable
Is the y-axis the vertical (up-down) or horizontal (side-side) axis? What is commonly on the y-axis in bar graphs?
The y-axis is the vertical axis of the graph which commonly shows the number of votes/people/responses.
When we skip count by 2s in a pictograph, what does this tell us about what our scale is?
The scale is 2! What we can skip count by is the scale!
What is one part of a graph that we can compare with other graphs? Tell me one thing we can compare.
How data is represented, what type of graph it is, scale, etc.
What kind of statistical question is this (i.e., which of the three categories?)
"Who is the tallest student in the school?"
Measurement
If we had to display 150 student votes for a school's favourite type of pizza, what type of graph would we use to show the data?
Bar Graph
Why is it important to choose the right scale? Give me one reason we've discussed in class.
1. It is easier to read
2. Data can be easily compared if we use an appropriate scale.
On a pictograph, if we have 5 symbols beside a category and the scale is 2, what is the total number of votes for that category?
a. Total = 5
b. Total = 10
c. Total = 2
b. Total = 10
Is "How many stars are there in the universe?" a good statistical question? Why or why not?
No. It starts with a keyword, can't have a group of responses, and it is not answerable (it is a fact).
What is something that is found on all three types of graphs (bar graphs, pictographs, dot plots)?
A title
If you were given this set of data, which scale would be the MOST appropriate?
"100 students were surveyed on their favourite sport. 12 voted for basketball, 28 voted for volleyball, 40 voted for hockey, and 20 voted for soccer."
a. Scale = 2
b. Scale = 5
c. Scale = 8
B. Scale = 5
On a bar graph, if there were 28 votes for vanilla ice cream and 12 votes for strawberry ice cream, how many more votes did vanilla get as compared to strawberry?
28 - 12 = 16