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Stats Sem 1 Review Flashcards | StudBud
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Stats Sem 1 Review
Stats Sem 1 Review
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1
If a segmented bar chart shows notable differences of data, then it is
Even
Unique
Independent
Not independent
2
True or false. The picture is an example of the normal model.
False
True
3
A z-score is
How far you are from A
The distance between the median and the mode
How many standard deviations from the mean that a value is
The height of the curve
4
If this point was removed from this association, would it increase or decrease?
Increase
Decrease
5
What is the term for the most common number?
Standard Deviation
Midrange
Mode
Median
6
true or false. You must control variables, randomize, and replicate an experiment to be valid.
False
True
7
For questions that ask for a percent to be calculated, we use
Normalcdf
Invnorm
8
What is the interquartile range?
Q2-Q4
Q2-Q1
Q3-Q1
Q4-Q3
9
Describe the shape of this distribution.
Uniform
Skewed left
Bimodal and skewed.
Unimodal and symmetric
10
Describe the association.
Straight, negative, moderate
Negative, Linear, Strong
Positive, Linear, Strong
No association association
11
True or false. Categorical data does not make sense to calculate a mean.
False
True
12
____% of the variation in y can be explained by X. This is
R in context
X in context
R-squared in context
Y in context
13
The two types of data we studied are
Research and analytical
Quantitative and qualitative
Statistical and categorical
Categorical and quantitative
14
The word or in a probability question signifies
Division
Addition
Multiplication
Subtraction
15
The median is the
The center number when data is sorted
Middle number
Same as the mean
The average
16
Formula for finding a range.
Max-Min
Max+Min
Max/Min
Min-Max
17
For questions that give you a percent and have you find an X , we use
Invnorm
Normal Model
18
The association in this picture has a r of
0.3
0
-1
1
19
SAT scores
Quantitative
Categorical
20
Data are not curved if a residual plot
Shows no form
Shows a curve
Shows form
Shows a circle
21
Describe the association.
Positive, trumpet, weak
Positive, Quadratic, Strong
Negative, outlier, linear, moderate
Negative, gap, quadratic moderate
22
What is the equation for LinReg?
Ax+By=C
y=a+bx
Y=X
Y=mx+b
23
A type of study where no treatments are imposed and cannot show cause and effect are called
Retrospective Studies
Observational studies
Perspective Studies
Experimental study
24
When ___ ____ is done correctly, it can determine cause and effect.
Observational study
Response bias
Experimental design
Statistical simulation
25
Age groups
Categorical
Quantitative
26
The Normal Model is also known as the
Best model
The 68-95-99.7 Rule
Fundamental Theroem of Stats
The 25-50-75-100 Rule
27
Being an _____ point means that it affects the slope
Unusual
Noninfluential
Influential
Unique
28
According to the model, ____ increases/decreases approx ____ by ____. This is
R in context
Y in context
Slope in context
X in context
29
Describe the shape of this distribution.
Bimodal
Skewed Left
Unimodal and Symmetric
Skewed Right
30
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 SDs below the mean
.0987 SD above the mean
0.728 z scores below the mean
0.386 SDs above the mean
31
When data is skewed, the mean is pulled
And increases
Upward
Towards the middle
In the direction of the skew
32
Things that cannot happen at the same time are
Mutually inclusive
Independence
Variance
Mutually exclusive
33
Phone numbers
Quantitative
Categorical
34
Type of sample. Randomly select a department and survey all the people in it.
Systematic
Cluster
SRS
Stratified
35
We use venn diagrams for
Comparing AP classes
Finding z scores
Probability
Statitics
36
In the LinReg equation, A stands for
R^2
Strength
Y-int
Slope
37
Which of the following is not a good way to sample a population?
Convenience
Cluster
Stratified
Systematic
38
When questions ask if there is a relationship in the association, remember that
It is always true
Correlation does not mean causation
Correlation is independent
Correlation means causation
39
Are a snow day and the number of car crashes that day positively or negatively associated?
Negative
Positive
40
When describing the data distribution of quantitative data, we use the acronym
FOMO
STDEV
SOCS
DOFS
41
This reduces variation and splits the subjects into homogenous groups.
Blinding
Blocking
Randomizing
Matching
42
If you calculate a positive residual, the actual value was
Less than the predicted value
More than the predicted value
43
Weight
Categorical
Quantitative
44
All of the following are types of quantitative data except
Height
Distance
Zip codes
Weight
45
An effect is ____ _____ if it is too great to be caused by chance.
Statistically insignificant
Statistically significant
Very insignificant
Very significant
46
A parameter is
A number calculated from a sample.
A number calculated from a population.
A unit of stats
The distance around a shape.
47
For describing a association, we use the acronym
SOCS
DUFS
SPDC
USA
48
Which is correct?
Both-Given/Both
Given|Both
Both|Given
Both+Given
49
What type of graph is this?
Pie chart
Histogram
Segmented bar graph
Bar chart
50
Describe the association.
Negative, curved, weak
Skewed
Positive, gap, very weak
No association
51
If x and y are swapped,
R flips
R changes
R doesn't change
R may change
52
The closer our proportion gets to the theoretical probability
Law of small numbers
Theorem of stats
Law of large numbers
Law of statistics
53
The word and in a probability question signifies
Division
Multiplication
Subtraction
Addition
54
You can display categorical data on all of the following charts except
Contingency Table
Histogram
Bar graph
Pie chart
55
What is a residual?
A plot
A number indicating how many SD you are from the mean
A plot that shows a curve or no curve
The difference between the observed y value and predicted y value
56
Which of the following is not a form of design?
Completely Randomized
Blocking
Double blind
Matched pairs
57
How do you mathematically figure out if a point is an outlier or not?
Calculate 1.5 * IQR and add or subtract from Q1 or Q3
Determine if it changes the slope of the data
If it looks far away it must be an outlier
Calculate how far it is from the mean
58
Making a prediction outside of the data given means you are
Hypothesizing
Inferring
Extrapolating
Exploring
59
A 5 number summary is used for a
Histogram
Pie chart
Box plot
Bar Graph
60
The proportion of times the outcome would occur for a large number of repetitions is called
A simulation
An event
Independence
Probability
61
An example of a systematic sample would be asking
Everyone you like
Everyone in one group
Everyone in your school system
Every 10th person
