Data Collection and Representation
Math ⇒ Statistics and Probability
Data Collection and Representation starts at 6 and continues till grade 12.
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See sample questions for grade 12
A frequency distribution table has the following class intervals: 10-20, 20-30, 30-40, 40-50. If the frequency for 20-30 is 8, what is the cumulative frequency up to 30?
A researcher collects data on the number of hours students study per week and their exam scores. Which type of graph is most suitable to display the relationship between these two variables?
A researcher wants to study the average height of students in a school. She measures the height of every 10th student on the school roster. What sampling method is she using?
Describe one advantage and one disadvantage of using interviews for data collection.
A class of 40 students was surveyed about their favorite sport. The results are: Football: 16, Basketball: 12, Cricket: 8, Tennis: 4. What percentage of students prefer Basketball?
A data set contains the following values: 5, 7, 7, 8, 10. What is the median?
A data set has the following values: 2, 4, 4, 6, 8, 10. Calculate the mean.
A frequency distribution table has the following class intervals: 10-20, 20-30, 30-40, 40-50. If the frequency for 20-30 is 8, what is the cumulative frequency up to 30?
Which of the following best describes stratified sampling?
(1) Every member has an equal chance of being selected
(2) The population is divided into groups and a random sample is taken from each group
(3) Only volunteers are selected
(4) The first n members are selected
Which of the following graphs is most appropriate for representing categorical data?
(1) Histogram
(2) Bar chart
(3) Line graph
(4) Scatter plot
Which of the following is a continuous variable?
(1) Number of cars in a parking lot
(2) Height of students
(3) Number of books on a shelf
(4) Number of siblings
Which of the following is a disadvantage of using secondary data?
(1) It is time-consuming to collect
(2) It may not be relevant to the current study
(3) It is always more accurate
(4) It is always up-to-date
Fill in the blank: In a stem-and-leaf plot, the _______ represents the leading digit(s) and the leaf represents the trailing digit.
Fill in the blank: The _______ is a graphical representation of the cumulative frequency distribution.
Fill in the blank: The _______ is the value that appears most frequently in a data set.
Fill in the blank: The _______ of a class interval is calculated as (upper limit + lower limit) / 2.
True or False: A census involves collecting data from every member of the population.
True or False: A frequency polygon is constructed by joining the midpoints of the tops of the bars of a histogram.
True or False: A histogram can be used to represent both discrete and continuous data.
True or False: Data collected through observation is always free from bias.
