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First Statistics for Economics and Business Tutorial
Lecturer: Dewi Ratna Sjari
Tutor: Venty | [email protected]
Date: Sept, 11 2013
1. A population is a collection of all individuals, objects, or
measurements of interest.TT2. There are four levels of
measurement-qualitative, quantitative, discrete, and
continuous. F
3. A store asks shoppers for their zip code to identify market
areas. Zip codes are anexample of ratio. F
4. A marketing research agency was hired to test a new DVD
player. Consumers ratedit outstanding, very good, fair, or poor.
The level of measurement for this experiment
is ordinal. T
5. Statistics is defined as a body of techniques used to
facilitate the collection,organization, presentation, analysis and
interpretation of information for the purpose
of making better decisions. T
6. Categorizing voters as Democrats, Republicans and
Independents is an example ofinterval level measurement. F
7. Based on a sample of 3,000 people, the civilian unemployment
rate in the UnitedStates was 5.5%. 5.5% is referred to as a
statistic. T
8. A frequency distribution groups data into classes showing the
number of observationsin each class. T
9. In frequency distributions, classes are mutually exclusive if
each individual, object, ormeasurement is included in only one
category. T
10. When constructing a frequency distribution, try to include
overlapping stated classlimits, such as 100 up to 201, 200 up to
301, and 300 up to 401. F
11. To construct a histogram, the class frequencies are plotted
on the vertical orY-axisand either the stated limits, the true
limits or the midpoints are plotted on the
horizontal orX-axis. T
12. A cumulative frequency distribution is used when we want to
determine how manyobservations lie above or below certain values.
T
13. The height of a bar in a histogram represents the number of
observations for a class. T14. A frequency polygon is a very useful
graphic technique when comparing two or more
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distributions. T
15.The main purpose of descriptive statistics is to Summarize
data in a useful andinformative manner.
16.The incomes of a group of 50 loan applicants are obtained.
Which level ofmeasurement is income? Ratio
17.A marketing class of 50 students evaluated the instructor
using the following scale:superior, good, average, poor, and
inferior. The descriptive summary showed the
following survey results: 2% superior, 8% good, 45% average, 45%
poor, and 0%
inferior. C
a) The instructor's performance was great!!!b) The instructor's
performance was inferior.c) Most students rated the instructor as
poor or average.d) No conclusions can be made.
18.Your height and weight are examples of which level of
measurement? Ratio19. Ordinal level of measurement is considered
the "lowest" level of measurement. F20. The words descriptive
statistics and inferential statistics can be used
interchangeably.
False
21. The Union of Electrical Workers of America with 9,128
members polled 362members regarding a new wage package to be
submitted to management. The
population is the 362 members. False
22. If we select 100 persons out of 25,000 registered voters and
question them aboutcandidates and issues, the 100 persons are
referred to as the population. False
23. Another name for inductive statistics is descriptive
statistics. False24. The order that runners finish in a race would
be an example of continuous data. F25. A frequency distribution for
qualitative data has class limits. False26. The midpoint of a
class, which is also called a class mark, is halfway between
the
lower and upper limits. True
27.Which word is NOT part of the definition of descriptive
statistics? Da) Organizingb) Analyzingc) Presentingd)
Predictinge)None of the above
28.What type of variable is the number of gallons of gasoline
pumped by a filling station
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during a day? B
a) Qualitativeb) Continuousc) Attributed) Discretee)None of the
above
29.When data is collected using a qualitative, nominal variable,
what is true about afrequency distribution that summarizes the
data? B
a) Upper and lower class limits must be calculated.b) A pie
chart can be used to summarize the data.c) Number of classes is
equal to the number of variable's values.d) The "5 to the k rule"
can be applied.
30.In a frequency distribution, what is the number of
observations in a class called? Da) Class midpointb) Class
intervalc) Class arrayd) Class frequencye) None of the above
