Stat 111 Spring 2015 Homework 10, due Wednesday, 4/22
DO THESE QUESTIONS FROM THE BOOK: Chapter 22: #14bc, 17, 18
Chapter 23: #1, 2, 3
Also:
Carry out the following hypothesis tests us
1
Lecture 14
Chapter 16 - continued
Sequential events
What is the probability of tossing two heads in a row?
There is only one way to do this, and there are four possible outcomes in a two-coin
toss. So the
Stat 111 Spring 2015
Homework 8
In addition to this handout, write up problems 1, 4, 7, 10, 11, 12, 16, and 23 in Chapter 18
on lined notebook paper.
1. Hypothetical results from 10,000 mammograms for women with tumors:
positive
mammogram
tumor is maligna
Stat 111 Spring 2015
Name:
HW #5 (due in discussion Mon 2/23)
section:
Given the following bivariate data set:
x y
1.Sketch the scatterplot of the data below. Plot the
5 10
point ( x, y ) and circle it.
5 6
7 7
7 5
8 8
8 6
8 3
10 7
10 5
12 3
2. Use 2-Var
Lecture 2
Consider a few types of studies:
1. Salk experiment: randomized experiment
2. Aspirin/heart attack study: randomized experiment
3. Sponge Bob study
4. Obama approval ratings.
What do we want to know about a
Protocols for generating one variable statistics on TI-83/84 graphing calculators:
To enter a list of numbers:
1. press STAT, ENTER
2. If there is data that you do not want under L1, L2, ., press the up arrow
until it highlights the name of the list (L1,
Lecture 16
Chapter 20 Estimating Proportions with Confidence
Chapter 20 differs from chapter 19 in that it is real, not hypothetical. Just as in real
life, we do NOT know the true population proportion in advance
Stat 111 Spring 2015 Homework #4 (due Tuesday 2/17)
The following data sets are normally distributed:
a) GRE (Graduate Record Exam) individual test scores:
mean= 530 , standard deviation= 128
b) Wechsler IQ scores:
mean= 100 , standard deviation= 15
c) le
1
Lecture 9
Chapter 12 Relationships between Categorical Variables
In chapter 10 we saw that if you have two measurement variables X and Y,
- the graph of the paired data points is a scatterplot
- the lin
Lecture 4
I. Definitions: validity, reliability, bias
A valid measurement measures what it claims to measure.
- Are IQ tests a valid measure of pure intelligence (see the web link on
IQ tests)
A reliable measurement returns the same (or a similar) value o
Lecture 6
Two-Number Summary (the traditional measures): mean and standard deviation
The mean is a measure of center. It is the sum of the data values divided by the
sample size. The mean is sensitive to outli
Stat 111
Calculator Protocol 2
Finding an exact confidence interval estimate using STAT TESTS.
The goal is to find an interval estimate of a population proportion p.
Example: we want to estima
Stat 111 Spring 2015 Homework #3 (due 2/9)
I. Do the following problems from chapter 7 in the text: #1, 2, 8, 9, 11, 12, 19 .
II. On a separate sheet of paper, write up the following problems based on
the data set below (n=27):
35, 48, 57, 58, 59, 60, 62,
Stat 111 Spring 2015 Homework 9
Name:
In addition to the five questions below, on a separate piece of notebook paper, do
problems #2, 5, 6, 8, 13, and 17 in chapter 19 (p. 368).
1. Suppose that 53% of voters in a state oppose a law that allows illegal imm
Lecture 15
We are now into Part IV of the textbook: Making Judgments from Surveys and
Experiments. A better title would be Inferential Statistics. In the remaining
chapters we will try to answer the following ques
DEPARTMENT OF MATHEMATICS AND STATISTICS
UNIVERSITY OF MASSACHUSETTS AT AMHERST
STATISTICS 111
SYLLABUS
SPRING 2015
Instructor: Brian Burrell, 1244 LGRT, 545-0924 burrell@math.umass.edu
Textbook: Seeing Through Statistics (3rd edition) by Jessica Utts, pu
Lecture 13
Examples of how to use the four rules of probability:
Example 1:
Define the following events:
A = the morning train does not leave on time
B = the morning train leaves on time
C = the train home
1
Lecture 11
Chapters 14 Price Indexes
This chapter deals with how we analyze historical price data in light of inflation. The
tool it introduces that allows us to compare price data is the price index. A pric
Stat 111 Spring 2015 Quiz #1
1. A
is a statistical study in which the
sampling units are randomly assigned to different treatment groups.
2. A
is a number that describes some
attribute or characteristic of a sample.
3. A measurement is said to be
if it me
Stat 111 Spring 2015 KEY
Key to additional review questions from Chapter 19 and 20
1. Suppose that 53% of voters in a state oppose a law that allows illegal immigrants to
obtain drivers licenses. Assume repeated random samples of 400 voters are conducted,
Lecture 1
I. Recap of the aspirin/heart attack study (read in chapter 1).
Aspirin
Placebo
HA
104
189
no HA
10933
10845
total
11037
11034
rate
9.42 per 1000
17.13 per 1000
II. BPA and breast cancer, prostate cancer, etc. (see MOODLE)
III. The Salk experime
Lecture 20
Statement of the Hypotheses in a Hypothesis test
A null hypothesis is always a statement of equality. The alternative hypothesis is
always a statement of inequality. Thus the null hypothesis will in
1
Lecture 19
Chapter 22 Hypothesis Testing
Statistics is about making comparisons. Often the comparison is made between
something you expect to happen (this is often called the claim) and what you observe
in
Stat 111
Calculator Protocol 3 - Graphing
In this tutorial we will use the four data sets weve worked with in class.
dataset 1 (n=25)
cfw_38,45,48,51,55,55,58,60,65,68,68,70,72,74,75,78,78,78,80,83,84,85,90,90,92
Stat 111 Spring 2015
Name:
Homework #6
1. Create a price index for the following set of prices using 1980 as the base year. Fill in
the spaces with the index number rounded to the nearest tenth.
year
cost
1950
2.15
1960
2.39
1970
3.05
1980
3.19
1990
3.69
1
Stat 111 Spring 2015
Practice Test #1
1. A telephone survey of American dentists found that, "Overall, about 65% of dentists
believe that public drinking water should be fluoridated."
a) If the survey involved 1189 respondents, what would the approximat