Statistics Chapter 2 and 3
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1
What is used to describe Quantitative/Numerical distribution?
Shape, Center, Spread/Variability
2
x-bar (x̄) means...
sample mean
3
μ (miu) means...
The population mean
4
(s) lowercase s means...
The Standard Deviation
5
n means...
sample size/number of observations or data values
6
Sigma (Σ) means...
The sum
7
True or False, Median is not resistant to outliers...
False, median is resistant to outliers
8
What are the 2 measures of center?
Mean and Median
9
xi
each observation
10
How do you find range?
Max - Min
11
True or False, mean is sensitive to outliers...
True, mean is sensitive to outliers
12
When there is skewed distribution, what is used to find the spread/variability?
IQR/Quartiles
13
What is used to describe/find center? (Quantitative/Numerical distribution)
Mean, Median
14
Unimodal means...
Distribution with one prominent mound/peak
15
Complete the 5 number rule with the following data set - 34, 67, 103, 22, 21, 70, 54, 21, 90, 20
min: 20, median: 44, Q1: 21, Q3: 70, IQR: 49
16
How do we describe or measure shape? (Quantitative/Numerical disribution)
Symmetric, Skewed right, Skewed left,
17
When there is symmetric distribution, what is used to find spread/variability?
Standard Deviation
18
Explanatory variable
Independent variable, The variable you manage or control that is not affected by any other variables.
19
Name the the graphs used for Quantitative/Numerical variables...
Histogram, Stem and leaf plots, Dotplots, Line graphs
20
Bimodal means...
Distribution with 2 separated mounds/peaks
21
How do you find the IQR
Calculate the difference of Q3 and Q1
22
When there is skewed distribution, what is used to find center?
Median
23
Response variable
Dependent variable, The variable that researchers are trying to explain or predict.
24
3 main concepts used to summarize data...
Shape, Center, Spread/Variability
25
What are the 3 main types of graphs for displaying quantitative/numerical?
Dotplots, Histograms, Stem and leaf plots
26
Name graphs for Qualitative/Categorical data
Pie chart, Bar graph/chart
27
What is used to find/calculate the spread/variability (Quantitative/Numerical distribution)
Standard deviation, IQR
28
How do you find lower and upper fence?
Q1-1.5(IQR) and Q3+1.5(IQR)
29
Empirical rule also known as...
68%-95%-99.7% rule
30
Standard/Z score is calculated by...
(observation - mean)/(standard deviation)
31
When there is symmetric distribution, what is used to find center?
Mean
32
What is the 5 number summary?
Find/calc the min value, median, Q1, Q3 and IQR
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