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Probability and Statistics Review
What is a population?
the median of this boxplot is closest to:
Probability and Statistics Review
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Answers
1
the median of this boxplot is closest to:
65
60
50
70
2
What is a population?
A whole of something
A total of something
A subject to specify
3
Does this scatterplot have a positive, negative, no correlation?
No correlation
Negative
Positive
4
Is this a statistical question?
no
yes
5
Find the mode.
20
10
35
25
6
Who is "blinded" in a single blind experiment?
Both the subjects AND the experimenter
Either the subjects OR the experimenter
The Experimenter
The subjects
7
You roll a die. Find P(4 or 5)
2/6
4/6
5/6
1/6
8
What is the IQR of the following boxplot?
10
8
4
6
9
Dot Plot
11 seconds
10.1 seconds
10.7 seconds
10.4 seconds
10
Describe the shape of the histogram.
skewed left
symmetrical
skewed right
11
You randomly choose from the following coins. What is the probability of not choosing the penny?
3/4
1/2
1/4
2/4
12
Find the median
8
7
91
6
13
Determine whether the data is quantitative or categorical:
Quantitative
Neither
Categorical
14
is this a good bar chart?
NO
YES
15
You roll a single die. Find P(4)
16.67%
15%
12%
25%
16
Observational Study
bird watching
study with treatment
study where the results are invalid
study with no treatment
17
What is wrong with this pie chart?
adds up to more than 100%
nothing
too many categories
overlapping categories
18
Experiment vs an Observational Study
Experiments impose treatments, but observations do not.
Experiments require informed consent before participation
observations may have confounded variables experiments don't
observational studies are always biased.
19
Find the mean of the following data set
10.4
12.7
3
11.1
20
Looking at this venn diagram what is P(C AND N)?
6
6/20
10/30
6/30
21
Mutually exclusive events are events that:
Cannot be possible at the same time
Exclusive mutually
Understand each other well
Are not dating other sets of data
22
Is this a statistical question?
yes
no
23
How many more days did it snow in February than in January?
6
4
10
8
24
Which has a larger standard deviation?
Not enough information
Car
Same
Bus
25
Refer to the stemplot to answer the question
47
52
48
57
26
What Is the Correlation Of the Scatterplot
Negative
Positive
No Correlation
27
Is party affiliation (Democrat/Republican/Independent) a categorical or quantitative variable?
Quantitative
Neither
Categorical