Wayground logo

Free Printable Worksheets

Font size

S
M
L
XL
Worksheets

Ch. 3 Intro Statistics Review

Total questions: 60

Worksheet time: 1hrs 10mins

Name
Class
Date
1.
1. A sample in which every person, object, or event has an equal chance of being selected.
a)
A. Random sample.
b)
B. Biased sample.
2.
_______ is the entire group of objects or individuals considered for a survey.
a)
Sample
b)
Population
c)
Random Sample
d)
Quartile
3.
A state fair had 1,019,887 people in attendance. The fair committee performed a survey. The question was, “What do fairgoers enjoy most about the fair?” Of those who responded, 83% reported eating traditional foods. Which group of people represents the sample group?
a)
Fair goers who like traditional foods
b)
The fair committee
c)
Fair goers who responded to the survey
d)
All fair goers
4.

Elise, a supermarket employee, approached 50 random customers and asked whether they would be willing to discuss what they like most about the store. She interviewed the 22 who said yes. Is this sample of the supermarket's customers likely to be biased?

a)

yes

b)

no

5.
Why do we randomly select our samples?
a)
for control
b)
reduce bias
c)
so we don't get the same answers from everyone
d)
to eliminate confounding results
6.
A school randomly chose ten English teachers and asked them which type of juice their students would prefer. Which reason best shows why this sample is biased?
a)
The sample didn't include students.
b)
The sample is too small.
c)
The sample can only be accurate if each teacher is included in the sample
7.

Is the following question biased? Why or why not?

"To see who has a computer at home, the front office asks 10 randomly chosen students from each grade."

a)

Yes, because it favors the responses from one grade over the others

b)

Yes, because it is a random sample.

c)

No, because it is a random sample.

d)

No, because most students have computers.

8.

Which scenario would produce the least biased results?

a)

asking athletes at a gym what their favorite television show is

b)

asking fans at a baseball game who their favorite baseball team is

c)

asking shoppers at a store where their favorite place to shop is

d)

asking students in a college library what their favorite college sports team is

9.

A factory manufactures light bulbs. The factory currently has 300 boxes of light bulbs in its warehouse. To test the quality of bulbs, Alex decides to take out a sample of bulbs and test them to see if they work. Which surveying method will give him the LEAST valid results?

a)

selecting ten boxes randomly, mixing the bulbs of these boxes together and then selecting ten bulbs randomly

b)

selecting ten boxes randomly and then selecting one bulb randomly from each box

c)

selecting one bulb randomly from every tenth box

d)

selecting one box randomly and then selecting all the bulbs from the box

10.
True or False: all samples lead to a good prediction about an entire population.
a)
True
b)
False
11.
Mrs. Boyd wants to find the average height of all her students in her classes. She decides to use the first 5 people who walk in the door. Is this a good representative sample?
a)
Yes
b)
No
12.
Unbiased sampling is:
a)
when you choose the group you think will represent the sample
b)
when any member of the population is equally likely to be chosen for the sample
13.
Dylan wants to know how the students at his school rate the cafeteria.  He surveyed his school's basketball team to rate the school cafeteria. Is this a biased sample of the school's population?
a)
Yes, because it is a convenience survey
b)
No, the basketball team has the smartest students
c)
Yes, because it's voluntary survey
d)
No, he should have asked the football team
14.

What is a factor that is measured for change in an experiment?

a)

control

b)

constant

c)

explanatory variable

d)

response variable

15.
The part of the experiment that does not contain the independent variable. Used for comparison.
a)
Control Group
b)
Experimental Group
c)
Results
d)
Data
16.
Can pleasant aromas help a student learn better? Two researchers believed that the presence of a floral scent could improve a person’s learning ability in certain situations. They had 22 people work through a pencil-and-paper maze six times, three times while wearing a floral-scented mask and three times wearing an unscented mask. The three trials for each mask closely followed one another. Testers measured the length of time it took subjects to complete each of the six trials. They reported that, on average, subjects wearing the floral-scented mask completed the maze more quickly than those wearing the unscented mask, although the difference was not statistically significant. This study is
a)
a convenience sample 
b)
an observational study, not an experiment
c)
an experiment, but not a double-blind experiment 
d)
a double-blind experiment
17.
The SDSU Student Union wants to know what type of events students are interested in so they decide to get a sample of undergraduate students. Which of the following would be the least useful variable to stratify by?
a)
major
b)
whether or not a student lives on or off campus
c)
grade level
d)
whether or not they drink coffee
18.
An amateur gardener decides to change varieties of tomatoes for this year to see if the yield is improved. He puts 6 of the old type of tomato plants and 6 of the new tomato plants in his garden. The average yield for the old plants was 11.3 pounds and the average for the new plants was 14.5 pounds. This is an example of
a)
an experiment
b)
an observational study
19.
A television station is interested in predicting whether voters in its viewing area are in favor of federal funding for abortions. It asks its viewers to phone in and indicate whether they support/are in favor of or are opposed to this. Of the 2241 viewers who phoned in, 1574 (70.24%) were opposed to federal funding for abortions.
This method of sampling likely suffered from...
a)
undercoverage
b)
voluntary response bias
c)
response bias
d)
non-response bias
20.
210 college students were randomly assigned to play either a violent or nonviolent video game.  A short time later, the students were presented with the opportunity to trivially harm another person and results comparing the two groups were recorded.
Is this study OBSERVATIONAL or EXPERIMENTAL? 
a)
Observational
b)
Experimental
21.
A study is conducted to investigate the relationship between owning pets and happiness. 100 subjects are randomly selected and data on whether or not a pet is owned and a happiness score (1‐10, 10 being extremely happy) are obtained.
Is this an OBSERVATIONAL or EXPERIMENTAL study?
a)
Observational
b)
Experimental
22.

What is the difference between an observational study and an experiment?

a)

Observational studies compare data.

b)

Experiments impose treatment on the subjects.

c)

Experiments involve having multiple treatments.

d)

Observational studies have subjects and treatments.

23.

A report in a medical journal notes that the risk of developing Alzheimer's disease among subjects who regularly opted to take Ibuprofen was about half the risk among those who did not. Is this good evidence that Ibuprofen is effective in preventing Alzheimer's?

a)

Yes, because the study was a randomized, comparative experiment

b)

No, because the effect of Ibuprofen is confounded with the placebo effect

c)

No, because this is an observational study. An experiment would be needed to confirm (or not confirm) the observed effect.

d)

Yes, because a 50% reduction can't happen just by chance

24.

In a completely randomized experimental design...

a)

A control group must be used as a baseline for comparing the effects of the other treatments.

b)

Similar subjects are grouped into blocks.

c)

A placebo treatment is always used.

d)

All experimental units are immediately randomly assigned to treatment groups.

25.

A control group in an experiment is...

a)

a group of similar subjects blocked together at the beginning of an experiment

b)

a group that does not receive treatment (or receives a placebo treatment) to provide baseline data for comparison

26.

Describe the placebo effect.

a)

Subjects are unaware of which treatment they are receiving

b)

Subjects have a favorable response to a "fake" treatment

c)

Subjects AND researchers are unaware of which treatment is assigned to which subject.

27.

How many rats do they need to start this experiment?

(a)  

28.

Statistically significant means

a)

a difference in mean too large to occur simply due to chance variability in the random assignment.

b)

a difference in mean small enough that it could be due to chance variation in the random assignment.

29.

Is a difference of 0.2 statistically significant?

(100 dots total)

a)

No

b)

Yes

30.

Is a difference of 0.4 statistically significant?

(100 dots total)

a)

No

b)

Yes

31.

Is a difference of 0.3 statistically significant?

(100 dots total)

a)

No

b)

Yes

32.

_______ is a part of a group being surveyed.

a)

Sample

b)

Population

c)

Random Sample

d)

Quartile

33.

_______ is the entire group of objects or individuals considered for a survey.

a)

Sample

b)

Population

c)

Random Sample

d)

Quartile

34.

A beverage company wanted to see if people in the United States liked their new logo. Which choice best represents a population?

a)

A selection of logo artists.

b)

Every person in the United States.

c)

A selection of shoppers from different states.

d)

3,800 children age 5 - 15

35.

Which survey question is most likely to result in an unbiased sample?

a)

Which do you like better, delicious apples or boring oranges?

b)

Do you prefer apples, like I do, or oranges?

c)

Don't you prefer apples to oranges?

d)

Which do you prefer, apples or oranges?

36.
Kim surveys 100 moviegoers that entered the movie theater in the first hour.  What type of sampling method is this?
a)
Random
b)
Convenience
c)
Biased
37.

A sample that does not fairly represent the population is called a _________________ sample

a)

random

b)

convenience

c)

biased

d)

population

38.

What type of sample is this?

A person stands in a crowded park and asks whoever is nearby to answer a series of survey questions.

a)

Systematic Response Sample

b)

Simple Random Sample

c)

Voluntary Response Sample

d)

Convenience Sample

39.

What type of sample is this?

A magazine conducts a survey asking readers to go to their website and answer a series of questions about health and beauty.

a)

Systematic Response Sample

b)

Simple Random Sample

c)

Voluntary Response Sample

d)

Convenience Sample

40.

A valid conclusion can be made from a biased survey.

a)

True

b)

False

41.

A TV producer wants to do a survey to find out which reality show is the favorite of viewers in Omaha, NE. Which of the following is the most unbiased sample?

a)

Sample 1

b)

Sample 2

c)

Sample 3

42.

This occurs when there is a systematic pattern of inaccurate answers to a survey question

a)

nonresponse

b)

confounding

c)

response bias

d)

placebo effect

43.

A treatment that has no active ingredient, but is otherwise like other treatments.

a)

observational study

b)

factor

c)

experiment

d)

placebo

44.

Measusres the outcome of a study.

a)

explanatory variable

b)

response variable

c)

confounding variable

d)

factors

45.

This deliberately imposes some treatment on individuals to measure their responses.

a)

explanatory variable

b)

response variable

c)

factor

d)

experiment

46.

This is what happens when two variables are associated in such a way that it is not possible to distinguish between their effects on the response variable.

a)

compounding

b)

confounding

c)

experiment

d)

census

47.

This does not try to influence the responses in a study.

a)

experimental study

b)

census

c)

observational study

d)

confounding study

48.

When neither the subjects nor the individuals recording the response variable know which treatment a subject receives.

a)

experimental design

b)

single-blind design

c)

double-blind design

d)

census design

49.

What does SRS stand for?

a)

Simple Random Sample

b)

Survey Random Samples

c)

Simple Random Survey

d)

Sample Random Surveys

50.

A recent survey found that 77% of high schoolers use their phones more than 4 hours a day on average. The margin of error was 3%. What is the interval for which we could expect to find the truth of the population?

a)

77% - 80%

b)

74% - 77%

c)

74% - 80%

d)

50 million high schoolers - 120 million

51.

Why is a sample of 1000 people better than a sample of 100 people?

a)

It reduces the margin of error.

b)

It decreases bias.

c)

Having more people is always better.

d)

More people means that our results are more accurate.

52.

How do we reduce variability?

a)

Increase randomness.

b)

Increase sample size.

c)

Decrease randomness.

d)

Decrease sample size.

53.

A recent survey found that out of 400 random American adults, 89% pay their bills on time. The margin of error in this survey was 2%. What is the interval of values in which the truth is likely found?

a)

89% - 91%

b)

87% - 89%

c)

87% - 91%

d)

388 - 402

54.
Complete the equation: 
point estimate +/- _____
a)
standard deviation
b)
margin of error
c)
critical value
d)
confidence level
55.
Suppose that $51,759 was the median income for all households in 2012. Does the interval ($51,484, $52,394) provide convincing evidence that the median household income increased in 2013? 
a)
Yes
b)
No
56.
Is there bias? 
A four company wants to know what percent of local households bake at least twice a week. A company representative calls 500 randomly selected households during the daytime. 
a)
Yes
b)
No
57.
What can you do to reduce the margin of error? 
a)
increase the confidence level
b)
decrease the confidence level
c)
increase sample size
d)
decrease sample size
58.
Given the interval (1.2, 1.8), what is the point estimate and the margin of error? 
a)
1.5, 0.6
b)
1.5, 0.3
c)
1.2, 0.3
d)
1.2, 0.6
59.

A newspaper asks its readers to call in and answer the following question, "Are young adults unprepared for college?" What type of sample is this?

a)

Convenience Sample

b)

Random Sample

c)

Voluntary Response Sample

d)

Call in sample

60.

What is the point estimator for the interval (-5 , 13)?

a)

10

b)

9.5

c)

9

d)

-5

Similar Resources on Wayground

ALG1 - Unit 2 - Algebraic Expressions and Equations - REVIEW

60 questions

ALG1 - Unit 2 - Algebraic Expressions and Equations - REVIEW

quiz

Worksheet

•

9th - 12th Grade

Geom Chapter 4 Review

57 questions

Geom Chapter 4 Review

quiz

Worksheet

•

10th - 12th Grade

Unit 5 test review

60 questions

Unit 5 test review

quiz

Worksheet

•

9th - 11th Grade

Sector and Arc Length 2

65 questions

Sector and Arc Length 2

quiz

Worksheet

•

9th - 11th Grade

Test 2 Review Part 1: complex basics, add/subtract complex

60 questions

Test 2 Review Part 1: complex basics, add/subtract complex

quiz

Worksheet

•

8th - 11th Grade

Review of Basic Algebra Skills

55 questions

Review of Basic Algebra Skills

quiz

Worksheet

•

11th - 12th Grade

Congruence (Unit 3)

61 questions

Congruence (Unit 3)

quiz

Worksheet

•

9th - 12th Grade