Measures of centre and spread
What measure of centre is found by adding all values and dividing by how many there are
Mean
Explain what an outlier is and how it might impact the shape of a data set
Significantly differ then other data points in a data set
A class was surveyed about where they went on their most recent holiday. What kind of data are the survey results.
Continuous numerical
Another name for a sector chart is
Pie chart
What does “frequency” mean in a data set
How many times a value occurs
A runner travels 600 m in 2 minutes. What is their speed in m/s?
5 m/s
If a graph has a long tail to the right, it is called
Positively (right) skewed
Counting the number of pets someone has is what type of data
Discrete numerical data
How many degrees are in a full circle of a pie chart
360
A data set is: 3, 5, 3, 7, 3, 5. What is the frequency of 3
3
What is the median of the data set: 10, 4, 7, 16, 9
9
If most data is at the low end and a few values are high, what is the shape called
Right skewed
Height or weight is what type of data
Continuous numerical data
If 25% of students like soccer, how many degrees is that in a pie chart
90
A student counts how many pets her friends have: 1, 2, 2, 3, 2, 1, 4. How many friends have 2 pets
3
Give me an example of a five number data set where the median would be a better measure of centre than the mean
2,3,7,8,27
A set of data is strongly positively skewed. If the median is sixty , if the mean is less than, equal to or greater then sixty.
greater than sixty
Favourite colour is what type of data
Categorical
A pie chart has a sector of 72° for basketball. What percent of students like basketball
20
A class of 15 students got these scores: 5, 6, 5, 7, 6, 5, 7, 6, 8, 7, 5, 6, 7, 8, 6. Which score occurs most often, and how many times
6 occurs 5 times
Explain why this data set does not have a mode 4,8,1,2,5,9,3,6
Because every score occurs the same amount of time
Test scores are all close to the middle value with very few very low or very high. How would you describe the shape
Symmetrical
Teachers at a high school were asked which students scored higher then seventy in the end of term science test.
How could you rewrite the question so the answer would be numerical
How many students scored more then seventy in your most recent science test
A pie chart shows 5 categories. One category is 54°. If 200 students were surveyed, how many chose that category
30 students
A teacher records the number of books each student reads in a month: 1, 2, 3, 2, 4, 3, 2, 5, 3, 4, 2. How many students read less than 3 books
5 students