Self-test Questions


1	Which of the following variables are discrete?

		A)	The shoe size of females living in London
		B)	The speed of cars travelling on the M25
		C)	The average number of children in a family
		D)	A and B
		E)	B and C

2	________ sampling is a mixture of quota sampling and random sampling.

		A)	With replacement
		B)	Without replacement
		C)	Simple random
		D)	Stratified
		E)	Cluster

3	A scattergram indicates trends in the data.

		A)	TRUE
		B)	FALSE

4	What is a histogram?

		A)	A pictorial representation of frequency distribution.
		B)	A graphical way of showing the relationship between variables.
		C)	A way of counting the number of items of data in each class of a frequency table.
		D)	A graph where both the horizontal and vertical axes represent cumulative percentages.
		E)	A pictorial representation of different categories of data within a dataset.

5	To make large datasets easier to present and describe, data is grouped into classes defined by class boundaries, which make it clear in which class each data element fits.

		A)	TRUE
		B)	FALSE

6	The ________ data relevant to a study is all possible relevant data.

		A)	sample of
		B)	population of
		C)	primary
		D)	non-random
		E)	judgemental

7	Which of the following is not a survey error?

		A)	Coverage
		B)	Positive
		C)	Non-response
		D)	Sampling
		E)	Measurement

8	What sort of survey error might be caused by a leading question?

		A)	Coverage
		B)	Positive
		C)	Non-response
		D)	Sampling
		E)	Measurement

9	A frequency distribution shows the number of data items in each

		A)	Statistic
		B)	Histogram
		C)	Ogive
		D)	Class
		E)	Mean

10	If the mean, median and mode are equal, this tells you that the distribution is not symmetrical.

		A)	TRUE
		B)	FALSE

11	Which measure of location is the middle value in an ordered set of data?

		A)	Mode
		B)	Standard deviation
		C)	Arithmetic mean
		D)	Range
		E)	Median

12	Someone describes the typical holiday for someone living in the UK as two weeks. Which measure of location is being used here?

		A)	Mode
		B)	Standard deviation
		C)	Arithmetic mean
		D)	Range
		E)	Median

13	The interquartile range describes the difference between the lowest and highest data point.

		A)	TRUE
		B)	FALSE

14	Why can the Mean Absolute Deviation not be used to develop statistical theory?

		A)	Because it uses negative numbers.
		B)	Because it only applies to ordinal data.
		C)	Because it uses absolute values.
		D)	Because it involves dividing by zero.
		E)	Because the answers are always whole numbers (integers).

15	If the RPI in January 2003 is 160 and prices rise by 10% in the year, what will the value of the RPI be in January 2004?

		A)	166
		B)	176
		C)	170
		D)	16
		E)	144

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