Homework 2 deadline Thursday, Feb 18 (I will collect in class, but if you are ready , you can bring to your TA in discussions)
Problem 1.The five-number summary of credit hours for 24 students in a st
Chapter 8 Estimation of the mean and proportion Confidence Intervals.
8.2 Estimation of a population mean : known .
Always check assumptions first
Case I. If the following three conditions are fulfill
Chapter 3.1, 3.2
Numerical descriptive measures
Graphs provide a global/qualitative description of
a sample, but they are imprecise for use in
statistical inferences.
We use numerical measures which c
Chapter 5.1 5.3:
1. The process of randomly selecting a family is called a random or chance experiment.
a. A random variable is a variable whose value is determined by the outcome of a
random experime
Final EXAM review
It covers : Exam 1 - correlation and linear regression
Exam 2 ( I will skip Chapter 4)
Chapter 8. Confidence Intervals for the population mean (use z and t)and proportion ,
minimum s
Final EXAM — review
It covers : Exam 1 ‘- correlation and linear regression
Exam 2 - normal , binomial distribution, expected value of a random variable
Chapter 8‘ s r : ' * Conﬁdence Intervals for th
Stat 240.
Worksheet 3 Wednesday
1. Medical researchers enlisted 90 subjects for an experiment comparing treatments for depression. The subjects were
randomly divided into three groups and given pills
Legal Studies 250
Final Exam Study Guide
Your final exam will be held on Wednesday May 10th in our regular classroom from 3:30-5:30
pm. It is designed to test your ability to recall, apply, analyze, e
Chapter 9.2 l-lypotltesis tests about It: a known
Case I. If the following three conditions are fulfilled:
I. The population standard deviation 6 ist known
2. The sample size is small (i.e. a < 30)
3.
Stat 240.
Worksheet 3 Monday
1. The following are a sample of test scores from a 100-point test: 61, 50, 100, 85, 15 ,65, 75, 70 , and 90.
(a ) Construct a box-plot to display the data
(b) describe th
Chapter 4.1-4.4. Probability .
Remember the objective:
Probability
1.
Population
Sample
2.
Describe the
sample data
3.
Probability
Compute measures of
variability
4.
1
Why the price of a car insurance
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Chapter 3.1 and 3.2
Numerical descriptive measures
Graphs provide a global/qualitative description of a
sample, but they are imprecise for use in statistical
inferences.
We use numerical measures whic
3.4 USE OF STANDARD DEVIATION
Empirical Rule
For a bell shaped distribution approximately
1. 68% of the observations lie within one standard
deviation of the mean
2. 95% of the observations lie within
Chapter 1.
1.1.What is statistics?
The field of statistics is evolving and growing in
ways few imagined even 15 years ago.
The field of statistics has been around for
centuries, yet its significance t
Chapter 2.
Organizing and graphing data.
Graphing data is the first and often most
important step in data analysis
The following handout discuss common graphs
for qualitative and quantitative variable
Chapter 4. Probability
Remember the objective:
Population
Probability
Probability
Sample
Describe the
sample data
Compute measures of
variability
1
1. Probability and statistics are both related to a
Take Home Exam IV:
R exam over Chapters VIII, XI
1. ( 5 pts.) Suppose your data sample consists of the following scores on a history
exam:
Scores = c(28, 40,21, 26, 17 ,27, 21, 28, 36, 34, 22, 29, 40,
Supplemental Exercises Stat240
Chapter 6
Exercise 1
For a standard normal distribution with mean 0 and standard deviation equal to 1:
A) Find the following probabilities
1 ( < 1.50)
2 ( > .98)
3 ( .25
DEPARTMENT OF MATHEMATICS AND STATISTICS
UNIVERSITY OF MASSACHUSETTS
Stat 240
EXAM 2
April 9, 2015
NAME:
Discussion session (name of your TA):
.
No Talking during the exam.
Turn off / put away all cel
To download Minitab - 30-day free trial - go to:
http:/www.onthehub.com/minitab/
If you are Mac user , you have to choose Minitab Express , if you are Window user - Minitab 17
is a better choice.
Lab
Bivariate Data part 1 (both variables are
categorical)
Example : Data were collected to measure the effect of
the body weight on the blood pressure in individuals
aged between 15 and 30.
Sample unit:
3)
A data set on money spent on lottery tickets during the past year by 200
households has a lowest value of $1 and a highest value of $2680.
Suppose we want to group these data into 6 classes of equa
Christian Pineda, Ziyi Ma, Alex Zeng
TA- Mengyuan Wu
Stats 240
May 2, 2017
Stats240 Data Analysis Project
Introduction:
Students that attend UMass Amherst have the luxury of participating in extra-cur
= x P(x)
E(x) = x P(x)
2
2
x
P
(
x
)
The mean and standard deviation of a binomial distribution :
np
and
npq
Normal distribution
z
x = + z
P( x) n C x p x q n x
x
Sampling Distribution of the Sampl