What does DUFuS stand for ?

Direction, unusual, form, scatter/strength

What is a random variable?

Value based on the outcome of a random event

A simple random sample is

Everyone in a space that has the same chance of selection

A number calculated from a population.

How far you are from the mean, How many standard deviations from the mean a value is

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Q1 Review

100 termsStudBud Administration125 plays

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

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