Welcome to your Grade 12 Mathematics chapter 7
After carefully reading the following 30 questions, choose the correct answer.
1.
Which type of data is collected by the researcher themselves for a specific purpose?
2.
Data that can take any value within a given range is classified as:
3.
What is the term for the difference between the upper and lower class boundaries?
4.
The midpoint of a class interval is known as the:
5.
A frequency distribution where the frequency of each class is added to the frequencies of all previous classes is called:
6.
Which graphical representation uses adjacent rectangles where the area represents the frequency?
7.
In a frequency polygon, the points are plotted using the frequency and the:
8.
An "ogive" is a graph representing:
9.
For grouped data, the mean is calculated using the formula xˉ=∑fi∑fixi, where xi represents:
10.
The mode of a grouped frequency distribution is found in the class with the:
11.
The median of grouped data is the value that corresponds to which cumulative frequency?
12.
Which measure of central tendency is most affected by extreme values (outliers)?
13.
Variance is a measure of:
14.
The standard deviation is the:
15.
If all values in a data set are the same, the variance is:
16.
The coefficient of variation (CV) is used to compare the:
17.
Quartiles divide a data set into how many equal parts?
18.
The difference between the third quartile (Q3) and the first quartile (Q1) is called the:
19.
Deciles divide a distribution into:
20.
Percentiles divide a distribution into:
21.
In statistics, the "range" of a dataset is defined as:
22.
When calculating the mean of grouped data using an assumed mean A, the deviation di is:
23.
A distribution with two modes is called:
24.
The sum of the relative frequencies in a distribution is always:
25.
In a histogram, the width of the bars represents:
26.
Mean Deviation is calculated by taking the average of the:
27.
The formula for the Mode of grouped data is L+(Δ1+Δ2Δ1)w, where L is:
28.
For a symmetric distribution, which relationship is true?
29.
Population in statistics refers to:
