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WorksheetsRequiz 9.1-9.3
Total questions: 20
Worksheet time: 22mins
Identify the population:
A survey of 500 adults in the U.S. found that 54% drink coffee daily.
A. Collection of the 500 adults surveyed
B. Collection of all adults in the U.S.
C. 54%
D. 500
Identify the sample:
A survey of 500 adults in the U.S. found that 54% drink coffee daily.
A. Collection of the 500 adults surveyed
B. Collection of all adults in the U.S.
C. 54%
D. 500
True or false:
In the statement “A survey of 500 adults in the U.S. found that 54% drink coffee daily” 54% is a parameter.
A. TRUE
B. FALSE
Identify the sampling technique used:
Students are classified according to major. Twenty students are selected from each major and asked how often they use the library.
A. Random sample
B. Stratified sample
C. Cluster sample
D. Systematic sample
Complete the definition:
A _______ is a subset of a population
sample
sampel
people
statistics
group
Complete the definition:
A _________ consists of all subjects (human or otherwise) that are being studied
Statistics
Number
People
Population
Pueblo
Population or Sample?
A factory overseer selects 40 threaded rods at random from those produced that week at the factory, then she tests their tensile strength.
Population
Sample
Population or Sample?
All of the teachers in a school are surveyed on their meeting time preferences.
Population
Sample
Is the given situation a parameter or statistic?
The average annual salary for 35 of a company's 1200 accountants is $68,000.
parameter
statistic
Is the given situation a parameter or statistic?
Sixty-two of the 97 passengers aboard the Hindenburg airship survived its explosion.
parameter
statistic
To test the effects of breakfast on grades I ask my students if they ate breakfast and then compare the breakfast eaters grades to the non-breakfast eaters.
This is an example of:
Observational study
Experimental Study
Neither
Both observational study and experimental study
To test the effects of eating breakfast on test grades. I randomly select half of my students and feed them breakfast while giving the other half nothing to eat. I then give them all a test and compare the test grades of each group.
Is this an experiment or an observational study?
Experiment
Observational study
Neither
Both experiment and observational study.
What's the probability of 49 < x < 51 ?
(Mean = 50, Standard dev = 6.5)
0.1192
0.1251
0.1587
0.0875
What is the formula to find the z-score for population?
z=X-M
z=σ-M/μ
z/M=μ
z=X-μ/σ
Find the Z-score.
Mean = 22
Standard Deviation: 3.1
x = 29
2.26
16.45
-2.26
1.26
Which is a normal distribution graph?
Determine if the following study is biased.
Carlos wants to know the favorite sport of people at his school so he asks his baseball team.
A. Biased
B. Unbiased
Determine if the following study is biased.
To see who has a computer at home the front office asks 10 randomly chosen students from each grade.
Biased
Unbiased
Ana wants to know the average student’s opinion of the tardy policy at her school. Which group of students should she survey in order to achieve the most accurate results?
A. Thirty randomly selected students from her school
B. Thirty students who are rarely tardy
thirty of her friends
