Chapter MCQ Test 2 — Organisation of Data
10 Questions • 12 min • Chapter MCQ
12:00
Question 1 of 10
A shoe shop records sizes as 6, 7, 8, 9 (never 7.5). The variable 'shoe size' here is treated as:
Discrete
Continuous
Qualitative
A constant
Explanation: Only whole, separate sizes occur, so it behaves as a discrete variable.
Question 2 of 10
To draw a histogram, an inclusive table (0–9, 10–19) is first converted to exclusive form (−0.5–9.5, 9.5–19.5) in order to:
Remove the gaps between classes
Add more data
Change the frequencies
Reduce the range
Explanation: Histograms need continuous classes, so the gaps of the inclusive method are closed first.
Question 3 of 10
If a frequency table of 50 observations has frequencies adding up to 48, it means:
Two observations were missed or mis-tallied
The table is correct
There are 48 classes
The range is 48
Explanation: Frequencies must total the number of observations (50); a total of 48 signals an error of two.
Question 4 of 10
In a class interval of width 10 with lower limit 60, the upper limit and mid-point are:
70 and 65
65 and 70
70 and 60
80 and 70
Explanation: Upper limit = 60 + 10 = 70; mid-point = (60 + 70) ÷ 2 = 65.
Question 5 of 10
Classifying data first makes later analysis easier mainly because classification:
Turns a confusing heap of figures into ordered groups
Increases the data
Collects the data
Removes all the data
Explanation: Grouping similar values brings order, so comparison and analysis become straightforward.
Question 6 of 10
From the table (0–10:2, 10–20:4, 20–30:5, 30–40:5, 40–50:4), the number scoring 30 or more is:
9
5
14
4
Explanation: 30–40 has 5 and 40–50 has 4, so 5 + 4 = 9 scored 30 or more.
Question 7 of 10
Temperature recorded as 36.6°C, 37.2°C, 38.5°C illustrates a ____ variable.
Continuous
Discrete
Qualitative
Geographical
Explanation: Temperature can take any fractional value in a range — continuous.
Question 8 of 10
Cumulative frequency is especially needed later to calculate the:
Median and to draw the ogive
Mode only
Range only
Class size
Explanation: The running totals (cumulative frequency) are used for the median and the ogive curve.
Question 9 of 10
Which classification base would you use to compare the populations of five different states?
Geographical
Chronological
Qualitative
Quantitative by income
Explanation: Comparing different places (states) uses geographical classification.
Question 10 of 10
A class interval written as 10–20 in the exclusive method actually covers values from:
10 up to but not including 20
10 and 20 both included
11 to 19 only
20 to 30
Explanation: Exclusive classes include the lower limit and exclude the upper, i.e. 10 ≤ value < 20.