QUIZ 1 - Sampling and Data
Level of measurement
# of traffic tickets
Distance from home to college
Weight of a newborn
Letter grade (A,B,C)
Movie ratings (0 to 5 star)
Year of birth
Favourite colour
ratio
ratio
ratio
ordinal/qualitative
ordinal
interval
nominal
Parameter or statistic
43.87% of voters turned out for the 2004 elections
20% of vehicles sold are compact cars
A hospital recently surveyed all their patients and found that 85%
were satisfied with their level of care
In weight loss research study, the sample of 50 men lost an avg. of 2.5 lbs
Medical researchers measured the heights of 125 males and found their
mean height to be 69.5 inches
Discrete or continuous data set
# of classes you are taking this quarter
Number of children in a family
Annual rainfall in centimetres
Amount (in hours) of exercise per week
Types of sampling techniques
In a study, the sample is chosen by writing
everyone's name on a playing card, shuffling the
deck, then choosing the top 20 cards.
A school district has a list of all of its 9th grade
students. They then collect data on the PSAT
score of 30 randomly selected students.
The school district randomly selects 3 high
schools in the district and then collects data on
PSAT score for all 9th graders in those districts
The school district collects data on the PSAT
score of the first 50 scores that are entered into
the system
The school district has a list of all 9th grade
students and then collects data on the PSAT score
of every 10th student on the list
The school district divides the 9th grade students
by high school attended and then collects data
from a random sample of 9th graders from each
high school
parameter
parameter
parameter
statistic
statistic
discrete
discrete
continuous
continuous
Simple random
Simple random
Cluster sample
Convenience sample
Systematic sample
Stratified sample
A measurement that describes a sample is called a
STATISTIC
Q1 A political scientist surveys 33 of the current 84 representatives in a state's legislature.
 size of the sample:
33
 size of the population:
84
Q2 Print-O-Matic would like to estimate their mean salary of all employees. To accomplish this
they collect the salary of 19 employees.
mean salary for all Print-O-Matic employees
Parameter
a Print-O-Matic employee
Individual
19 Print-O-Matic employees
Sample
Salary
Variable
mean salary for 19 Print-O-Matic employees
Statistic
all Print-O-Matic employees
Population