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class A statistics Flashcards | StudBud
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class A statistics
class A statistics
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Questions
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Answers
1
In a bar chart, what type of data is usually shown?
Numerical only
Categorical
Continuous data only
Probability
2
What is a variable in statistics?
A pie chart
A person
A survey result
Something you can measure
3
In the Prisoner’s Dilemma, how many people are making choices?
1
4
2
3
4
What is equilibrium in game theory?
When one player always wins
When both lose
When no one wants to change their choice
When everyone changes strategies
5
What is a random variable?
A value chosen without thinking
A number that represents the outcome of a random experiment
A chart used to display probability
A category from a survey
6
What makes a histogram different from a bar chart?
It shows ranges and bars touch
It uses numbers in groups
It shows answers with colors
It uses pictures
7
What does a bar chart NOT do?
Use bars of equal width
Show category data
Show exact values in a sequence (按顺序）
Compare values
8
What must the total probabilities in a distribution add up to?
1
100
0
10
9
What is a sample in statistics?
The biggest group in the world
A small group taken from a population
All the students in a school
A way to measure only numbers
10
What is true about dependent events?
They always involve numbers
Events occur on separate days
They never overlap
One event changes the chance of the other
11
What is experimental probability based on?
Actual results from an experiment
Values from other tests
Predictions using models
A guess without doing any real trials
12
Why do we use samples instead of studying whole populations?
Samples are always wrong
Populations are too large to study
Samples are more fun
Populations have no data
13
In game theory, what is a “player”?
A character in a game
The winner of the game
A person making decisions in the game
Someone who watches others
14
What is a dominant strategy in game theory?
The player who wins
A choice picked first
The best choice no matter what the other does
The most common one
15
What is the value of P(X = 0 head) for flipping 3 coins?
3/16
1/6
1/8
1/4
16
What kind of chart is best for showing parts of a whole?
Stem-and-Leaf Plot
Segmented bar chart
Line chart
Histogram
17
Which chart uses blocks of different sizes to show how groups are connected?
Histogram
Bar chart
Mosaic plot
Line plot
18
What symbol is often used for a random variable?
X
R
Z
V
19
What does a dot plot show?
Frequency
A list of questions
Chart of overlapping bars
Graph with random shapes
20
What is a biased sample?
A sample that includes all people
A sample that is unfair or limited
A sample that takes too long
A sample that is randomly chosen
21
What is the whole group we want to study called?
Variable
When one player always wins
Population
Sample
22
What is statistics mainly used for?
Collecting random facts
Guessing based on feelings
Understanding data and making decisions
Creating colorful graphs
23
Which chart shows numbers by splitting them into place values (like tens and ones)?
Stem-and-leaf plot
Dot plot
Bar graph
Pie chart
24
What type of data do histograms show?
Types of people
Colors and shapes
Survey answers only
Quantitative and numerical data
25
What is the “Chicken Game” about?
Sports teamwork
Eating contests
Drawing cards quickly
Risk decisions in a head-to-head game
26
What happens in equilibrium?
All players win
Everyone loses equally
No one changes their strategy
The game restarts
27
Which chart shows numbers by splitting them into place values (like tens and ones)?
Stem-and-leaf plot
Dot plot
Pie chart
Bar graph
28
What does a dominant strategy mean?
A choice that always loses
A weak choice
The best choice no matter what
A choice that always wins
29
What kind of data does a stem-and-leaf plot show?
Choices from a list
Survey answers
Numbers broken into parts
Picture-based results
30
Which of these is a
categorical variable
?
Age
Weight
Favorite color
Number of pets
31
In the Prisoner’s Dilemma, what is a dilemma?
A game
A hard choice between two things
A solution
A coin toss
32
If events are mutually exclusive, what does that mean?
They cannot happen at the same time
They’re from different graphs
They depend on each other
hey include more than one group
33
Which of these is a
numerical variable
?
Gender
Height
Type of car
Color
34
What is the main purpose of random sampling?
To skip hard work
To get only small answers
To reduce bias and improve accuracy
To save money
35
What does a probability distribution show?
0
100
10
1
36
What is the probability of flipping a fair coin and getting heads?
0.5
1
0.25
0
37
What is true about non-mutually exclusive events?
They happen once
They cancel out
They’re always separate
They can overlap
38
What is theoretical probability based on?
Logic and expected outcomes
Chart data
Real-world mistakes
Past trials
39
If two events do NOT affect each other, they are:
non-Mutually exclusive
Mutually exclusive
Independent
Dependent
40
What does a payoff matrix show?
How to draw graphs
Results based on each player’s choice
Which strategy is random
Number of rounds
41
What is experimental probability based on?
Values from other tests
Actual results from an experiment
Predictions using models
A guess without doing any real trials
42
What kind of chart has touching bars and shows ranges?
Histogram
Bar chart
Dot plot
Segment chart
43
What is the formula for mutually exclusive events?
P(A or B) = P(A) + P(B)
P(A) × P(B)
P(A or B) = 1
P(A and B) = 0
44
What is game theory about?
Playing fun games with friends
How people make choices in different situations
Telling stories in books
Making computer programs
45
Which chart is best for showing trends over time?
Histogram
Bar Chart
Line Chart
Dot Plot
