Concepts
Is the science of collecting, analysing, organising and interpreting data in order to draw conclusions.
Statistics.
Statistic is the science of collecting, analysing, organising and interpreting data in order to draw conclusions.
False.
Statistic is a numerical description of a sample.
In a recent survey of 1503 adults in the United States, 53% said they use both a landline and a cell phone. (Source: Pew Research Center)
Is this numerical description a parameter or a statistic?
Complete the statement:
Data at the interval level of measurement can be _____ and meaningful differences ____ be calculated. At this level, a zero simply represents a position in the scale.
A) ranked - can't
B) ordered - can
C) rationalise - can
D) ordered - can't
B) ordered - can
Determine whether the data set is a sample or a population.
The age of each member of the House of Representatives.
A) Population B) Sample
__________ is the branch of statistics that involves the organisation, summarisation and display of data.
a) Inferential statistics
b) Display statistics
c) Social statistics
d) Descriptive statistics
d) Descriptive statistics
A population refers to some elements of a group of interest.
False.
A population refers to all the elements of a group of interest.
As of January 2007, 44% of the governors of the 50 states in the United States are Republicans.
Is this numerical description a parameter or a statistic.
A) Parameter B) Statistic
It is a parameter. There are only 50 governors in the U.S.
Complete the following statement:
_______ is ________.
A) Inference - conclusions or deductions based on observations.
B) Inference - the belief that something is true.
C) Faith - conclusions or decutions based on observations.
D) Evidence - conclusions or deductions based on observations.
A) Inference - conclusions or decutions based on observations.
Determine whether the data set is sample or a population.
The height of every fourth person entering an amusement park.
A) Population B) Sample
A) Sample
What I read + what I know = ?
Inference
A parameter is a numerical description of a whole group of interest, whereas a statistic is a numerical description of a sub-group within the group of interest.
True.
The three political parties in the 110th Congress are listed below.
Democrat Republican Independent
What's the level of measurement of this data set?
A) Nominal level of measurement
B) Ordinal level of measurement
C) Interval leve lof measurement
D) Ratio level of measurement
A) Nominal level of measurement.
Complete the statement:
Discrete variables ________.
A) take on values that are always letters.
B) take on values that are qualitative.
C) take on values that are not continuous.
D) take on values that are continuous
C) Take on values that are not continuous.
A study to determine the climate type for a city in the tropics.
Which method of data collection is appropriate in this situation?
A) Simulation
B) Experiment
C) Observational study
D) Survey
C) Observational study.
The _______ variable is the one that suffers changes (or doesn't) when we make changes in the _______ variable.
a) independent, dependent
b) confident, dependent
c) dependent, confident
d)dependent, independent.
d) dependent, independent
Qualitative variables consist of nonnumerical entries (or if yes, they're used as a classification and not as a counting or measurement), labels, etcetera.
A pharmaceutical company wants to test the effectiveness of a new allergy drug. The company identifies 250 females 30–35 years old who suffer from severe allergies. The subjects are randomly assigned into two groups. One group is given the new allergy drug and the other is given a placebo that looks exactly like the new allergy drug. After six months, the subjects’ symptoms are studied and compared.
Which is the experimental group in this study?
A) 250 females
B) The group given the new allergy drug
C) The group given the placebo
D) Females who suffer from severe allergies
B) The group given the new allergy drug.
Research is important because ______.
A) the scientist can ignore the results of the previous studies.
B) the scientist can use the information to exactly copy the experiment and appropriate the results.
C) the scientist can use the information to formulate a hypothesis.
C) the scientist can use the information to formulate a hypothesis.
An economist is trying to estimate an average family income for families living in his city. As his city is composed of boroughs with different socioeconomic levels, he decides to randomly select families from different boroughs. Which sampling technique is he using?
A) Stratified sample
B) Systematic sample
C) Cluster sample
D) Random sample
A) Stratified sample.
The chance of an event occurring.
A) Possibility
B) Random variable
C) Probability
D) Inferential statistics
E) Destiny
D) Astrology
C) Probability
A researcher does a statistical study about the population of a city; as the city is composed of boroughs with very similar characteristics, she decides to use a whole borough as her sample. The sampling technique she must use is:
cluster sampling.
True
The following appear on an employment application. Identify the level of measurement of the data.
1. Highest grade level completed
2. Number of years at last job
3. Year of college graduation
4. Gender
1. Ordinal level of measurement , 2. Rational level of interval, 3. Interval level of measurement, 4. Nominal level of measurement.
In order to make conclusions about a population based on a sample, this has to be ______ and ________.
A) rationally selected - accumulative
B) rationally selected - representative
C) rationally selected - inclusive
D) randomly selected - representative
E) randomly selected - accumulative
F) randomly represented - selected
D) randomly selected - representative.
A study shows that Chicago -- a city with lower per capita number of firearms than that of Houston -- is more violent than Houston.
Choose a correct inference from the previous statement:
A) Houston is less violent than Chicago
B) Houston is violent
C) Chicago is as violent as Houston
D) The more firearms in a city, the safer this is.
E) The fewer firearms in a city, the safer this is.