Elementary Statistics Homework 1 2 3 4
5-6 6.3-7
8-10 | Tests Chapter 1-3
4 5-6 6.3-7 8-10 Final Review
Elementary Statistics
(STA2023)
Homework 1
The _________________ is/are
the entire group of individuals or items being studied.
Population
The _________________ is/are
a subset of the population that is being studied
Sample
A _________________ is a numerical measurement
describing some characteristic of a population.
Parameter
A _________________ is a numerical measurement
describing some characteristic of a sample.
Statistic
Suppose that a
researcher is interested in the average standardized test score for fifth
graders in a local school district. The fifth graders at a specific school
would comprise
a ___________
and their average test score would be a ___________.
Sample,
statistic
A ________________ variable classifies individuals
based on some attribute or characteristic.
Qualitative
A ________________ variable counts or measures
something and has numeric values
Quantitative
A quantitative
variable that has a finite or countable number of values is called _______
Discrete
A quantitative
variable that has an infinite number of possible values that are not
countable is called
Continuous
A polling company
reported that 27% of 1018 surveyed adults said that rising gas prices “are
very” harmful.
Complete parts (a) through (c) below.
What is the exact value that is 27% of 1018?
A. 274.86
1018 x .27 =
274.86
B.
No, the result from part
(a) would not be the actual number of adults who said that rising gas
prices
are very harmful because a count of people must result in whole number
C. The actual number of adults with this opinion could be 274.
Determine whether the given value is a statistic or a
parameter.
a study was conducted of all "1925" workers
The value is a parameter because it is a numerical
measurement
describing some characteristic of a population.
Determine whether the
underlined number is a statistic or a parameter
A
sample of employees is selected, and it is found that 40% own a television.
Statistic
because the value is a numerical measurement describing a characteristic of a
sample.
Determine whether the given value is from a
discrete or continuous data set
When a car is randomly selected, it is found to have a
tire pressure of 28 psi.
a continuous data set because there are
infinitely many possible values,
and those values cannot be counted
No explanation necessary!
Determine
whether the value is from a discrete or continuous data set.
Number
of students in a class is 23
Is
the value from a discrete or continuous data set?
Discrete
A discrete variable is a type of variable in statistics that
can only take on a finite or countably infinite set of values,
A continuous variable is a variable whose value is obtained by
measuring
Which of the following is associated with a
parameter?
Data that were obtained from an entire
population.
Which of the following consists of
discrete data?
Number of suitcases on a plane
A particular country has 50 total states.
If the areas of all of all 50
states are added and the sum is divided by 50,
the result is 210,584 square
kilometers.
Determine whether this result is a statistic or a parameter.
The result is a parameter because it describes some
characteristic of a population.
Determine whether the value is from a discrete or
continuous data set.
Amount of fabric needed for a dress is 2.5 yards.
Continuous because the value for the "amount of
fabric needed for a dress"
is one of infinitely many possible values and those values
cannot be counted.