Stat 101L Lecture 39
Categorical Data
In
Chapter 3 we introduced the
idea of categorical data.
In Chapter 15 we explored
probability rules and when events
are independent.
In Chapter 26 we put these two
ideas together to compare counts.
1
Categorical D
Statistics 101 Homework 5
Solution
Assignment:
1. How old is a tree? Cutting a tree down and counting the number of growth rings can
determine the age of a tree. It would be nice to have a non-destructive method for
determining the age of a tree. A forest
Statistics 101L Homework 3
Solution
Assignment:
Weights of adult males and females have increased over the past 40 years but so have
heights. The body mass index (BMI) combines information about an individuals height
and weight and can be used to classify
Statistics 101 Homework 2
Solution
Reading:
January 23 January 25
January 28
Chapter 4
Chapter 5
Assignment:
1. As part of a physiology study participants had their heart rate (beats per minute)
taken by a trained nurse practitioner. Below are heart rate
Statistics 101 Homework 6
Solution
Assignment:
1. Pew Research Center/USA Today conducted a public opinion survey between February 13th
and February 18nd, 2013. 1,504 randomly selected adults from across the United States were
contacted and asked the ques
Stat 101 L Homework 7
Solution
Assignment:
1. Below is a summary table of eye color and gender for students who took an introductory
statistics course.
Female
Male
Total
Blue
313
310
623
Brown
291
239
530
Green
175
85
260
Hazel
156
135
291
Total
935
769
1
Statistics 101 L Homework 11
Solution
Assignment:
1. For each of the following situations, indicate whether it is a two -sample problem or a paired
sample problem. Explain briefly your choice. Also indicate whether you would construct a
confidence interva
Statistics 101 L Homework 10
Solution
Assignment:
1. A major medical center in the Northeastern U.S. conducted a study looking at blood
cholesterol levels and incidence of heart attack. Below are cholesterol levels for 16
randomly selected people who have
Statistics 101 Homework 9
Solution
1. Many people are superstitious about the number 13. Friday the 13th occurred in January, April
and July of 2012 and will occur in September and December of 2013. But does
triskaidekaphobia (fear of the number 13) have
Statistics 101 Homework 8
Solution
1. The maker of M&Ms says on its website that 16% of Dark Chocolate M&Ms are
orange. Suppose that M&Ms are packaged at random. We wish to examine the
sample proportion of orange Dark Chocolate M&Ms, p , in various sized
Stat 101 Lecture 21
Probability
Subjective (Personal)
Empirical
Based on feeling or opinion.
Based on experience.
Theoretical (Formal)
Based on assumptions.
1
The Deal
Bag o chips (poker chips).
Some are red.
Some are white.
Some are blue.
Draw a chip f
Stat 101L: Lecture 26
Sampling Distribution Models
Population
Parameter: p
Population all items
of interest.
Random
selection
Sample a
few items from
the population.
Inference
Sample
Statistic: p
1
Sampling Distribution of p
Shape: Approximately Normal
Ce
Stat 101 Lecture 23
Random Variables
Discrete variables
Numerical values associated with
elements in a sample space.
Only distinct (discrete) points on
the number line.
1
The Deal - Continued
Bag o chips (poker chips).
Some are red.
Some are white.
Som
Stat 101L: Lecture 27
Example
p 0.56
p(1 p)
0.560.44
0.012
n
1772
0.56 20.012 to 0.56 20.012
0.536 to 0.584
1
Interpretation
We are 95% confident that the
population proportion of all
adults in the U.S. who believe
abortion should be legal is
between 53.
Statistics 101L Homework 1
Solution
Reading:
January 14 January 18
January 21 January 25
Chapters 1, 2, & 3
Chapters 4
Assignment:
1) For each of the following situations answer the questions Who? and What? When
answering the question What? be sure to ind