WorksheetsStatistics Test Review
Total questions: 53
Worksheet time: 4hrs 25mins
Roberto wants to know the favorite sport of adults in his hometown. He surveys 50 adults at a baseball game. Is this random or biased sampling?
Random
Biased
Interview every 10th student who enters the school in the morning.
simple random
voluntary response
systematic
convenience
Assign each car in a dealership a number and then use a random-number table to select the cars to be inspected.
systematic
simple random sample
convenience
Self - selected (volunteer)
Political webpages often allow readers to rate (if they want to) whether they strongly agree, agree, disagree, or strongly disagree with the President's decision on any given situation. This is a form of:
Self-Selected
Convenience Sampling
Simple Random Sampling
Systematic Random Sampling
Marianne wanted to know students' opinion on the new schedule at school. She survey's the first 30 students who come into her class.
Convenience Sampling
Systematic Random Sampling
Simple Random Sampling
Volunteer response
This is a form of:
A teacher wants to know the average time spent doing homework by the students in her class of 20 girls and 5 boys.
She selects the first five who raise their hands.
Systematic
Convenience
Self Selected
Simple Random
A teacher wants to know the average time spent doing homework by the students in her class of 20 girls and 5 boys.
She selects the five closest to her desk.
simple random
Self Selected.
Convenience
Systematic Random
A teacher wants to know the average time spent doing homework by the students in her class of 20 girls and 5 boys.
She picks the student in every 5th seat.
Simple Random
Systematic
voluntary response
convenience
One group of subjects was given an herbal supplement and another group was given a placebo. After one year, the number of illnesses each group had was compared.
Observational Study
Experiment
A researcher stood at a school parking lot entrance to see if the color of a car is related to the driver not wearing a seatbelt.
Observational Study
Experiment
A professor finds that people who are obese have higher cholesterol levels than those who are not obese.
Observational Study
Experiment
Four groups of randomly selected people are assigned a different diet. After six months, the blood pressures of each group are compared.
Observational Study
Experiment
You want to see if students who have a 4.0 grade point average study more than those who do not.
experiment
observational study
You want to compare the health of students who walk to school to the health of students who ride the bus
experiment
observational study
A researcher randomly assigned boys and girls to each of two groups. One group was assigned to watch a violent television program while the other group watched a nonviolent program. The children's behavior was then recorded for incidences of aggressive behavior. This research method is best characterized as...
experimental
Observation
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
Experiment
Researchers wanted to know if there is a link between proximity to high-tension wires and the rate of leukemia in children. To conduct the study, researchers compared the rate of leukemia for children who lived within 1/2 mile of high-tension wires to the rate of leukemia for children who did not live within 1/2 mile of high-tension wires.
Observational Study
Experiment
Rats with cancer are divided into two groups. One group receives 5 milligrams of a medication that is thought to fight cancer and the other receives 10 mg. After 2 years, the spread of cancer is measured.
Observational Study
Experiment
What does this symbol represent?
Standard Deviation
Variance
Mean Absolute Deviation
Sigma
What is the standard deviation for the data given:
5, 10, 7, 12, 0, 20, 15, 22, 8, 2
6.89
10.1
7.26
9
What is the standard deviation for the data given:
{12, 13, 29, 18, 61, 35, 21}
293.67
15.87
17.14
41.98
Given a variance of 64, what is the standard deviation?
8
4096
0
6.8
Then, 68% of all tires will have a life between ___________ km and __________ km.
About what percent of the products last between 12 and 15 days?
What is the percentage of data that falls within three standard deviations of the mean?
99.7%
98.7%
95%
100%
What is the percentage of data that falls within two standard deviations of the mean?
68%
99.7%
95%
98%
What is the percentage of data that falls within one standard deviation of the mean?
67%
65%
72%
68%
The Empirical (68-95-99.7) Rule can be applied only if data is ....
Normally Distributed
Uniform
Skewed
Symmetric
Describe the shape of the data.
Symmetrical
Skewed Left
Skewed Right
Describe the shape of the data.
Symmetrical
Skewed Left
Skewed Right
Describe the shape of the data.
Symmetrical
Skewed Left
Skewed Right
Describe the shape of the data.
Symmetrical
Skewed Left
Skewed Right
Describe the shape of the data.
Symmetrical
Skewed Left
Skewed Right
Describe the shape of the data.
Symmetrical
Skewed Left
Skewed Right
Find the Z-score.
Mean = 22
Standard Deviation: 3.1
x = 29
2.26
16.45
-2.26
1.26
Find the Z-score.
Mean = 21
Standard Deviation: 1.3
x = 22
0.77
5.33
1.07
1.26
Find the z-score.
Mean = 38
Standard Deviation: 1.2
x = 42
3.33
-3
3.03
-3.33
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
Use the image of the normal graph provided. What is the value of the mean?
6
34
52
70
Use the image of the normal graph provided. What is the value of the standard deviation?
6
12
36
18
What percent of scores are below a z-score of z=−1.02 ? (Use either the attached image of a z-table or use your own copy of the z-table from your notes)
15.87%
15.39%
9.68%
84.61%
What percent of scores are below a z-score of z=2.34 ? (Use either the attached image of a z-table or use your own copy of the z-table from your notes)
99.04%
0.96%
98.93%
97.68%
