Bob hits the same place every time on the dart board, but cannot hit the bullseye

Bob is precise but not accurate

Why is the normal distribution so important

Real-world random variables tend to follow this distribution

The confidence level is highest if

We have many samples with low variance

a way to model linear relationships between two variables

A probability density function describes

The likelihood of values for a random variable

What is a violin plot a combination of

box plot info + visual histogram

A cumulative distribution function tells you

Probability that a variable is less than a value

A wider confidence interval means

There is less certainty of the likely value

A confidence interval is accurate if

the interval contains the true value

Normal distributions are describe by

the mean and standard deviation

Which charts are most similar

Histogram and dist. plot (distributions plot)

What is a pandas data frame?

stores a table of data in python

In statistics, an experiment is

procedure with one of many outcomes

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SCDV-110 Wrap Up

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Sample questions for SCDV-110 Exam 4

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Questions 25

Answers

1
Bob hits the same place every time on the dart board, but cannot hit the bullseye
Bob is accurate but not precise
Bob is both accurate and precise
Bob is neither precise or accurate
Bob is precise but not accurate
2
Confidence intervals are based on
The variance or standard deviation of a sample
All of the answers are true
Sampling a population to see what is common
The number of data points sampled
3
Why is the normal distribution so important
Because it is in the book
Because abnormal things aren't important
Real-world random variables tend to follow this distribution
All data distributions can be described by it
4
Which is most similar
Standard deviation & mean
Variance & mean
Variance & median
Standard deviation & variance
5
In stats, an outcome is
a random variable
set of all possible experiments
a compound event
the result of an experiment
6
The confidence level is highest if
We have few samples with low variance
We have few samples of high variance
We have many samples with low variance
We have many samples of high variance
7
Linear regression is
a way to estimate the mean of a population
a way to reduce the size of a data set
a way to model linear relationships between two variables
a type of plot
8
The confidence interval is small
The variance is high
The confidence level is low
The mean is low
There are few samples
9
A probability density function describes
The weight of random variables
The likelihood of values for a random variable
Center of a distribution
The variability of a random variable
10
What is a violin plot a combination of
pie chart info + color labeling
box plot info + scatter plot visual
box plot info + visual histogram
bar chart + visual error bars
11
If you wish to decrease the probability of error in an estimate you can
Decrease the confidence interval
Decrease the sample size
Use a different critical z value
Increase the sample size
12
Which charts are most similar
scatter plot and line chart
bar chart and pie chart
violin plot and box plot
histogram and pie chart
13
The normal distribution is
All the answers are correct
also called the Gaussian distribution
very common for real world variables
a probability distribution with a bell-shaped curve
14
A cumulative distribution function tells you
Probability that a variable is less than a value
Probability that a variable is greater than a value
Probability that a variable equals a value
Probability that a variable is not equal to a value
15
A wider confidence interval means
Our estimate is less precise
There is less certainty of the likely value
Less variance in the sample
There is more certainty of the likely value
16
A confidence interval is accurate if
the interval contains the true value
the interval does not overlap with the true value
The interval is large
the interval is small
17
Normal distributions are describe by
The Q2 and Q3 values
the max and min value
the mean and standard deviation
the mean and median values
18
Which charts are most similar
Histogram and dist. plot (distributions plot)
Violin plot and pie chart
Bar chart and line chart
Box plot and scatter plot
19
What does a histogram tell you?
The distribution of data
All of the above
The most common values
The range of values
20
In probability and stats, what best describes "the Jets winning the superbowl"
It is an outcome
It is a data point
It is a solution space
It is an experiment
21
Which is NOT a measure of center
Mean
Median
Mode
Variance
22
A confidence interval is precise if
the interval overlaps the true value
the interval is small
the interval is large
the true value is outside the interval
23
In linear regression, we
minimize the error in a prediction
All the answer are correct
find best slope and y-intercept for a linear relationship
minimize distance between a line and data points
24
What is a pandas data frame?
library for doing stats
window for entering data in python
a csv file
stores a table of data in python
25
In statistics, an experiment is
procedure that tests a hypothesis
procedure with one of many outcomes
the same thing as a sample space
a random variable

SCDV-110 Wrap Up Flashcards | StudBud