Chapter 8 Producing Data: Sampling
-a sample survey selects a sample from the population of all individuals about which we desire information. We base conclusions about the
population on data from the
A diagnostic test for a certain disease
We expect its false positive rate is low.
False positive: if the test result for an
individual who does not have the disease
is positive.
Question: what is
STAT 101
Introduction to Statistics
Fall 2008
Midterm II Version A Solutions
Each multiple choice question is worth one mark, and short answer question is worth two
marks unless otherwise noted.
1)
A
STAT 101
Introduction to Statistics
Fall 2008
Assignment 4 Solutions
Each problem is worth one mark unless otherwise noted. When the final answer is incorrect,
partial marks may be assigned for statin
STAT 101
Introduction to Statistics
Fall 2008
Midterm II Version C Solutions
Each multiple choice question is worth one mark, and short answer question is worth two
marks unless otherwise noted.
1)
B
STAT 101
Introduction to Statistics
Fall 2008
Assignment 6 Solutions
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answer is incorrect, partial marks may be assigned for statin
STAT 101
Final Exam Review
Fall 2008
For material covered in Midterms I & II, please see the review information sent to you
earlier. In addition, you will need to know:
Chapters 15, 18-20:
Construct c
STAT 101
Introduction to Statistics
Fall 2008
Midterm II Version B Solutions
Each multiple choice question is worth one mark, and short answer question is worth two
marks unless otherwise noted.
1
)
a
STAT 101
Introduction to Statistics
Fall 2008
Assignment 3 Solutions
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When the final answer is incorrect, partial marks may be assigned for statin
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Chapte7 Exploring Data: Part I Review
Statistics road map:
Question formulation
Data production
Data analysis and summary
1.
One variable
a) Categorical
i.
Pie c
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Chapter 6 TWO-WAY Table
Relationships between two categorical variables (scatterplot = both
quantitative)
Counting is the only arithmetic operation that makes sense
Chapter 1
+ 1.5 x IQR
Sample Mean
-ADD values and DIVIDE by # of observations
x
x 1 + x 2+ x 3 + .+. x n
n
=
+ 1.5 x IQR
-Five-Number Summary
-consists of: Minimum
Q1 Median Q3 Maximum
-means are "sen
STAT 101
Introduction to Statistics
Fall 2008
Assignment 5 Solutions
Each problem is worth one mark unless otherwise noted. When
the final answer is incorrect, partial marks may be assigned for
statin
STAT 101
Introduction to Statistics
Mid Term I
Fall 2008
Solutions ( C )
Instructions
Each part of a problem is worth two marks unless otherwise noted.
When the final answer is incorrect, partial mark
STAT 101
Test Statistic Summary
Null Hypothesis (H0)
Test Statistic
0
t
x 0
s
n
~ t (n 1), s
Single Sample
Or
or
Z
x 0
/ n
(x
i
Fall 2008
x)2
n 1
~ N (0,1)
Matched Pairs
1 2
( 1 2 0)
t
x1 x 2
s12
Back to Example
Experiment: toss a fair coin twice
S = cfw_HH, HT, TH, TT
assign 1/4 to each possible outcome
X = the number of heads occur
All possible values of X: 0, 1, 2
Values
0
1
2
Probabil
Statistical Inference
Point estimation: use the sample mean xx to estimate the
population mean .
The law of large numbers ensures us that if we measure
enough subjects, the sample mean will eventual
Probability Model
A probability model for a random
phenomenon consists of a sample space S
and an assignment of probabilities P.
Finite Probability Models
A finite (fixed and limited) number of
outc
Correlation does not depend on which variable
you put on x axis and which on the y axis
Often, interests lie on whether or not changes
in x variable help explain changes in y variable
x variable: e
What if is unknown?
Recall the setting where the population distribution is
Normal with unknown mean and known SD .
We use the sampling distribution of x
Then the distribution of
is the standa
Maria Fernanda Gonzalez Rios
BISC113
July 16, 2017
Assignment 2
The salmon farms industry has impacted the environment in Vancouver Island BC. This
essay has as a purpose to contrast the Pros and Cons
The marks assigned for each question are shown in square brackets. Each mark is worth
0.25% of the course total.
1.
What is GPP? Discuss, in general terms, whether an elite athlete need to train
addit
Maria Fernanda Gonzalez Rios
STAT 101
June 6, 2017
Assignment 2
1. A study of king penguins looked for a relationship between how deep the
penguins dive to seek food and how long they stay underwater.
STAT 101 - Assignment # 1 Due on September 25th before 9.00 AM.
1. Page 20 Q # 1.4
2. Page 44 Q # 1.42
a) Make a Histogram instead of two stemplots using SPSS.
3. Page 60 Q # 2.10
c) Use SPSS to calcu
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Chapte8 Sampling
Sample survey:
Data production:
Select a sample (a part or subset) from a population
Data summarization:
Describe sample
Statistical inference:
Att
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Chapter 1
Individuals: objects described by a set of data
Variable: characterisic of an individual.
Categorical variable: just a label
Quanitaive variable : takes n
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Chapter 4 Scatterplots and Correlation
4.1 Explanatory and response variables
Bivariate data: two measurements (variables) on each individual in a study
we study t
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Chapter 5
5.1
Regression line:
Mathematical notation: y = mx + b; m= slope, b = intercept
Statistical notation: y hat = bx + a; a = intercept, b = slope, h hat = pr
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Chapter 2
Mean: average (refer as x bar); balance point of the data
N: sample size
X bar: mean of the sample of the data
The median: the formal diversion of the mid
1. Categorical variable: placed an individual categories. Ex: male or female
Quantitative variable: takes numerical values for which arithmetic operations such as adding and averaging makes sense. Ex:
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CHAPTER 3
The normal distribution
Always plot your data: make a graph, usually a histogram, or a stemplot.
Look for the overall pattern (shape, center, variability)