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AQR Unit 5_Statistical Studies Review_ROSS

Total questions: 50

Worksheet time: 2hrs 40mins

Name
Class
Date
1.

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?

a)

Experiment

b)

Observational study

c)

Neither

d)

Both experiment and observational study.

2.

A hospital wants to open a gym. They ask the night-shift ER staff when they would use the gym. Is this sample biased or unbiased?

a)

Biased

b)

Unbiased

c)

Not able to be determined.

3.

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 seat belt.

Which research method is most appropriate?

a)

Observational Study

b)

Experiment

c)

Census

d)

Correlation

4.
The research cycle is continuous.
a)
True
b)
False
5.
Statistical investigations are used every day for a variety of reasons.
a)
False
b)
True
6.
Conducting an experiment is an example of collecting
a)
primary data
b)
secondary data
7.
Conducting a survey is an example of collecting
a)
primary data
b)
secondary data
8.
Looking something up on the internet or in a book for a reasearch project is an example of collecting
a)
primary data
b)
secondary data
9.
Margin of error is a measure of how much the researcher messed up.
a)
True
b)
False
10.
A margin of error is a value that describes how far below or above the mean average you can expect the results to be.
a)
True
b)
False
11.
If a political canididate is in the lead with 50% of the votes but the poll reports a margin of error of +/- 10, the candidate could have as high as 60% of the votes.
a)
True
b)
False
12.
A hypothesis can be 
a)
null
b)
alternative
c)
both
13.

Interview every 10th student who enters the school in the morning.

a)

simple random

b)

voluntary response

c)

systematic

d)

convenience

14.

Assign each car in a dealership a number and then use a random-number table to select the cars to be inspected.

a)

systematic

b)

simple random sample

c)

convenience

d)

Self - selected (volunteer)

15.

Marianne wanted to know students' opinion on the new schedule at school. She survey's the first 30 students who come into her class.

a)

Convenience Sampling

b)

Systematic Random Sampling

c)

Simple Random Sampling

d)

Volunteer response

16.

A teacher splits her classes up by period. She then randomly picks 3 students from each period to do a survey.

a)

Stratified.

b)

Systematic

c)

Cluster

d)

Biased.

17.

The entire group of individuals we want information about in a statistical study.

a)

sample

b)

census

c)

population

d)

survey

18.

the small group we collect data from to generalize for a larger group.

a)

population

b)

census

c)

sample

d)

survey

19.

The design of a study that consistently underestimates or overestimates the value you want to know.

a)

Nonresponse

b)

Bias

c)

Voluntary response

d)

undercoverage

20.

The fact that difference random samples of the same size from the same population produce different estimates

a)

sampling variability

b)

bias

c)

undercoverage

d)

nonresponse

21.

an estimate that describes how far, at most, we expect the estimate to vary from the true population value

a)

hypothesis

b)

margin of error

c)

sampling variability

22.

______________ occurs when some members of the population are less likely to be chosen or cannot be chosen for the sample

a)

undercoverage

b)

nonresponse

c)

voluntary response

d)

response bias

23.

_____________ occurs when there is a consistent pattern of inaccurate responses to a survey question (due to wording of survey, interviewer, etc.)

a)

nonresponse

b)

undercoverage

c)

voluntary response

d)

response bias

24.

_____________ occurs when an individual chosen for the sample can't be contacted or refuses to participate.

a)

undercoverage

b)

nonresponse

c)

voluntary response

d)

response bias

25.

A ___________________ is a group used to provide a basline for comparing the effects of other treatments.

a)

treatment group

b)

control group

26.

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

a)

placebo

b)

control group

c)

treatment group

27.

In an experiment, this is when either or both the subject and the interviewer do not know which treatment is being given.

a)

blinding

b)

placebo

c)

placebo effect

28.
What is the minimum value?
a)
64
b)
58
c)
66
d)
60
29.
What is the maximum value?
a)
58
b)
66
c)
64
d)
60
30.
How many students have more than 1,000 songs on their MP3 player?
a)
5
b)
16
c)
10
d)
4
31.
Which has a Median of 1?
a)
Zach 
b)
Steven 
c)
They both have a median on 1
32.
Which interval has 400 employees?
a)
33-43
b)
0-10
c)
77-87
d)
66-76
33.

Select the graph that has a normal shape.

a)
b)
c)
d)
34.

Select the graph that is skewed right.

a)
b)
c)
d)
35.

Select the graph that is skewed left.

a)
b)
c)
d)
36.

Match the shape of the box and whisker to the shape of the histogram.

a)
b)
37.

Match the shape of the box and whisker to the shpae of the histogram.

a)
b)
38.

Match the shape of the dot plot to the shape of the histogram.

a)
b)
c)
d)
39.

Where is Q1?

a)

5

b)

10

c)

17

d)

20

e)

32

40.

Where is the median?

a)

5

b)

10

c)

17

d)

20

e)

32

41.

Where is Q3?

a)

5

b)

10

c)

17

d)

20

e)

32

42.

Where is the maximum?

a)

5

b)

10

c)

17

d)

20

e)

32

43.
Which box and whisker plot has the highest median?
a)
Top plot
b)
Bottom plot
44.

4. Which of the following lists all parts of the five number summary (what you need to make a box and whisker plot)?

a)

Mean, Median, Mode, Range, and Total

b)

Minimum, Quartile 1, Median/Quartile 2, Quartile 3, and Maximum

c)

Smallest, Q1, Q2, Q3, and Q4

d)

Minimum, Maximum, Range, Mean, and Median

45.

What is the MEDIAN of this data? Hint: there are 13 pieces of data. Which one would be in the middle?

a)

95

b)

90

c)

100

d)

40

46.
Which restaurant has a higher median wait time?
a)
Lucy's Steakhouse
b)
Gary's Grill
c)
They are the same
47.
Roger bowled 7 games last weekend. His scores are: 155, 165, 138, 172, 127, 193, 142. What is Roger's median score?
a)
127
b)
155
c)
156
d)
193
48.
What is the term that means the middle data value?
a)
Median
b)
Mode
c)
Mean 
d)
Range
49.
What do you do if there are two numbers in "the middle" when you are finding the median?
a)
Pick your favorite number
b)
Add the two numbers in the middle & then divide by two.
c)
They are both the median
d)
None of the above
50.

How do we reduce variability?

a)

Increase randomness.

b)

Increase sample size.

c)

Decrease randomness.

d)

Decrease sample size.

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