A simple random sample is

Everyone in a space that has the same chance of selection

A number calculated from a population.

When questions ask if there is a relationship in the association, remember that

Correlation does not mean causation

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Group 5

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This is my version of a practice midterm test for the best class ever, AP Stats. Happy learning:)

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Questions 100

Answers

1
When data is skewed, the mean is pulled
In the direction of the skew
In the direction of the title
Towards the graph
And is increased
2
A simple random sample is
Really easy
Really simple
Everyone in a space that has the same chance of selection
when you pick one person from each homogenous group
3
If you calculate a negative residual, that means that the actual value was
Less than the predicted value
More than the predicted value
4
A sampling scheme that combines several sampling methods
Simulation
Multistage
A process
Multi processed
5
A parameter is
The distance around a shape.
A number calculated from a sample.
A number calculated from a population.
A unit of stats
6
The association in this picture has a r of
-1
0
1
0.3
7
The proportion of times the outcome would occur for a large number of repetitions is called
An event
A simulation
Probability
Independence
8
What is the equation for LinReg?
y=a+bx
Ax+By=C
Y=mx+b
Y=X
9
What type of graph is this?
Pie chart
Bar chart
Histogram
Segmented bar graph
10
A 5 number summary is used for a
Box plot
Bar Graph
Histogram
Pie chart
11
In the LinReg equation, A stands for
Y-int
Strength
R^2
Slope
12
Formula for Figuring out midrange
1/2Range
Range^2
Min+max/range
Range-1/2
13
If this point was removed from this association, would it increase or decrease?
Increase
Decrease
14
If a segmented bar chart shows notable differences of data, then it is
Even
Not independent
Unique
Independent
15
All of the following are types of quantitative data except
Distance
Weight
Zip codes
Height
16
All of the following are ways you can rexpress data except
Log X, log y
1/y
x^1/2
Log y
17
We use venn diagrams for
Statitics
Probability
Finding z scores
Comparing AP classes
18
if I multiply each X by 100, add 12 to each y, and switch X and y, r
stays the same
increases
changes
decreases
19
____% of the variation in y can be explained by X. This is
Y in context
R^2 in context
X in context
R in context
20
What results from samples that do not represent the population?
Under coverage
Bias
Inaccurate numbers
People are upset they were left out
21
The experimental condition being imposed on the group is called the
Control group
Subjects
Level
Treatment
22
Are a snow day and the number of car crashes that day positively or negatively associated?
Positive
Negative
23
Weight
Quantitative
Categorical
24
Being an _____ point means that it affects the slope
Unusual
Influential
Unique
Noninfluential
25
Another way to express y=a+bx is
y=my+b
Y=mx+b
y=bo+b1x
Bo+Bix
26
A type of bias that only people that feel strong respond is called a
Under coverage
Voluntary response bias
Response bias
No response bias
27
Formula for finding a range.
Max+Min
Max-Min
Max/Min
Min-Max
28
This association has a r of
-1
1
0.3
0
29
Quadratic data has an r of
-1
0.8
1
0
30
An effect is ____ _____ if it is too great to be caused by chance.
Systematically significant
Quite significant
Systematically wrong
Very significant
31
Age groups
Categorical
Quantitative
32
true or false. You must control variables, randomize, and replicate an experiment to be valid.
False
True
33
The word and in a probability question signifies
Subtraction
Multiplication
Addition
Division
34
If x and y are swapped,
R doesn't change
R flips
R may change
R changes
35
For describing a association, we use the acronym
SuFUD
DUFuS
USA
CUSS
36
When re-exppressing data, you must run the ____ to check for a curve.
Model
LinReg
Stats buttom
Simulation
37
Describe the shape of this distribution.
Uniform
Skewed left
Unimodal and symmetric
Bimodal and skewed.
38
A study where it starts now and goes into the future is called a
Perspective study
Retrospective study
39
When questions ask if there is a relationship in the association, remember that
Correlation is independent
Correlation means causation
Correlation does not mean causation
It is always true
40
For questions that give you a percent and have you find an X , we use
Normal Model
Invnorm
41
For questions that ask for a percent to be calculated, we use
Normalcdf
Invnorm
42
You ask people if they are right handed until you get a left handed. This is a
binomial model
Geometric model
Algebraic model
Normal model
43
When describing the data distribution of quantitative data, we use the acronym
FBI
NASA
CUSS
DUFuS
44
An example of a systematic sample would be asking
Everyone in one group
Everyone you like
Every 10th person
Everyone in your school system
45
T/F: Experimental deisgn, principles,treatment, blinding, +response variable are needed 4 expe
True
False
46
The closer our proportion gets to the hypothetical probability
Law of large numbers
Law of statistics
Law of small numbers
Theorem of stats
47
In the LinReg equation, what does B stand for?
y int
Strength
slope
X int
48
Things that cannot happen at the same time are
Mutually inclusive
Mutually exclusive
Independence
Variance
49
Type of sample. Randomly select a department and survey all the people in it.
SRS
Stratified
Systematic
Cluster
50
If a ___ ____ is done correctly, it can determine cause and effect.
Stats study
Response bias
Stats simulation
Experimental design
51
SAT scores
Quantitative
Categorical
52
Which is correct?
Both|Given
Given|Both
Both+Given
Both-Given/Both
53
The two types of data we studied are
Statistical and categorical
Categorical and quantitative
Research and analytical
Quantitative and qualitative
54
All of the following are w questions associated with data except
Who
What
Which
Why
55
If a point is far left or far right from the mean, then it has
skewness
weight
height
leverage
56
All of the following are stated in the Bernoulli trials except
Trials are independent
Probability of success doesn't change
10% rule
Only 2 outcomes
57
What is the term for the most common number?
Mode
Midrange
Median
Standard Deviation
58
Describe the association.
Positive, gap, very weak
Trumpet
Negative, curved, weak
No association whatsoever
59
The first bulls eye is on the 3rd arrow
Geomertic model
Normal model
Stats model
Binomial model
60
True or false. The picture is an example of the normal model.
True
False
61
This reduces variation and splits the subjects into homogenous groups.
Randomizing
Blocking
Blinding
Matching
62
The word or in a probability question signifies
Multiplication
Addition
Subtraction
Division
63
When running a simulation, you should _____ it several times.
Try
Invent
Repeat
Create
64
The group where no treatment is applied is called the
Control group
Homogenous group
Uncontrolled group
Good group
65
This is when you multiply 0.05n and subtract that number from the data to figure out New mean
0.05 cut mean
5% data
5% trimmed mean
0.05% trimmed mean
66
What is a residual?
A plot that shiws a curve or no curve
The difference b/t the observed y value+predicted y value
A number indicating how many SD you are from the mean
A plot
67
What does DUFuS stand for ?
Direction, Unusual, Formality, Strength
Direction, Unique, Form, Scatter
Direction, unusual, form, scatter/strength
Distance, Unusual, Form, Scatter
68
Which of the following is not a good way to sample a population?
Stratified
Systematic
Convience
Cluster
69
The median is the
The center number when data is sorted
The average
The monkey in the middle
Middle number
70
According to the model, ____ increases/decreases approx ____ by ____. This is
Slope in context
Y in context
R in context
X in context
71
Any point that doesn't fit with the rest is called an
Outlier
Genius
Gap
Influential
72
Describe the association.
Positive, curved, strong
Positive, curved, moderate
Negative, curved, moderate
Negative, curved, weak
73
True or false. Categorical data does not make sense to calculate a mean.
True
False
74
Describe the association.
Negative, gap, quadratic moderate
Negative, outlier, linear, moderate
Positive, Quadratic, Strong
Positive, trumpet, weak
75
How do you mathematically figure out if a point is an outlier or not?
If it looks weird it must be an outlier
See if it looks unusual
Determine if it changes the slope of the data
Figure out the lower and upper fences
76
A z-score is
How far you are from the mean
How far you are from A
Your IQ score
How many standard deviations from the mean a value is
77
The Normal Model is also known as the
Fundamental Theroem of Stats
The 25-50-75-100 Rule
The 68-95-99.7 Rule
Best model
78
When the sample need to be less than 10% of the population, it is called the
10% theorem
10% rule
10% model
10% condition
79
An attempt to try to get everyone in the population is called a
Experiment
Census
Approval
Representative sample
80
You can display categorical data on all of the following charts except
Contingency Table
Pie chart
Bar graph
Histogram
81
Data are not curved if a residual
Shows form
Shows no form
Shows a circle
Shows a curve
82
A type of study where no treatments are imposed and cannot show cause and effect are called
Observational studies
Retrospective Studies
Perspective Studies
experimental study
83
___blinding is when the subject does not know what group they belong to or what the study is on
Single
Some
Triple
Double
84
A tree diagram is used for
Simulations
Calculating probabilities
Designing experiments
Finding z scores
85
What is a random variable?
The mean number of surveys ran in a simulation
The randomness of an experiment
Value based on the outcome of a random event
A number generated in a simulation
86
Phone numbers
Quantitative
Categorical
87
All of the following are types of graphs used to display quantitative data except
Stem and Leaf
Pictogram
Histogram
Timeplot
88
A placebo is
A blind group
A fake treatment
Something that was on greys anatomy
A type of experiment
89
Lying is a type of
Cluster sample
Mean act
Response bias
No response bias
90
If you calculate a positive residual, the actual value was
Less than the predicted value
More than the predicted value
91
The 5 number summary is used for this type of graph.
Box plot
Histogram
Bar graph
Pie chart
92
A and B have an r of 0.56. If A was less than the mean by 1.3 SDs, then B was _____ the mean
0.728 z scores below the mean
0.386 SDs above the mean
0.728 SDs below the mean
.0987 SD above the mean
93
Making a prediction outside of the data given means you are
Inferring
Exploring
Hypothesizing
Extrapolating
94
What is the interquartile range?
Q4-Q3
Q2-Q1
Q3-Q1
Q2-Q4
95
What does CUSS stand for?
Center, unique, spread, skewed
Centroid, unusual, shape, spread
Center, shape, spread
Center, unusual, shape, spread
96
Which of the following is not a form of design?
Double blind
Matched pairs
Blocking
Completely Randomized
97
A ____study is where the data has already been collected and you study certain aspects.
Perspective
Retrospective
98
The binomial model tells you
Percents
The two models
Probabilities
Number of people
99
Describe the association.
Negative, Linear, Strong
Positive, curved, moderate
No association whatsoever
Positive, Linear, Strong
100
Describe the shape of this distribution.
Skewed Right
unifrom
Unimodal and Symmetric
Bimodal

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