COMMONLY USED ASSESSMENT and SCREENING INSTRUMENTS
February 2004
Prepared for HIPPY USA
By
Marsha M. Black, Ph.D.
University of South Florida
Dept. of Child and Family Studies
In collaboration with
Dr. Diane Powell, Ph.D.
University of South Florida
Dept.
Chapter 3: Descriptive Statistics
1
Chapter 3
Descriptive Statistics
LEARNING OBJECTIVES
The focus of Chapter 3 is on the use of statistical techniques to describe data, thereby
enabling you to:
1.
Distinguish between measures of central tendency, measure
Practice Exercises
For QA251
Elementary Statistics
Professor K. Leppel
Introduction & Data Collection
1. Suppose you want to know the percentage of US citizens who deliberately underpay their
federal income taxes. You conduct a survey in which you ask 100
Class 2 variability 1
Measures of Variability
We have already discussed the most frequently used measures of central tendency. Measures of central
tendency allow us to select one number to represent a distribution of scores. In discussing them, we focused
MKTG 3710.001; Summer II (2003); Sample Questions for Exam-2
Sample Multiple Choice Questions
1. Random sampling error
A. is the difference between a survey that includes only those who responded and a survey that also includes
those who failed to respond
Case GARCH: Modeling Volatility Dynamics
A. Conditional Heteroscedasticity
This lesson introduces you to a recent development in forecasting asset returns.
ARMA forecasting model, which includes a random process as a special case, tracks the
level, define
CLASS NOTES on SAMPLING DISTRIBUTION and Central Limit Theorem (CLT)
Why Sample the Population? Why not study the whole population?
The physical impossibility of checking all items in the population.
The cost of studying all the items in a population.
The
MATH 1530 Quiz # 11
(Quizpak 5)
Name _
Assume that the readings on thermometers are normally distributed with a mean of 0oC and a standard deviation of 1.00oC . One
thermometer is randomly selected and tested. In each case, label and shade the graph , the
7.1 Sampling Distributions (Page 1 of 10)
7.1SamplingDistributions
ParametersversusStatistics
A parameter is a
Measure
Statistic Parameter
numerical measure of a
x
Mean
population. A statistic is
a numerical measure of a Variance
s2
Standard Deviation
s
s
These notes are excerpted from the text Quantitative Methods, by Esch, Bukowski, and Kruse. You
might find them useful in helping to determine if a given data set is normally distributed.
Normal Curve
Although frequency distributions can be of any shape (
22B
STAT101 Worksheet: Confidence Intervals
Identify the given information and determine the appropriate formula for the following situations.
Calculate the confidence interval for one item representing each of the formulas.
A) x z
2
n
s
B) x z
2
n
Descriptive Numerical Measures
49
CHAPTER 3. DESCRIPTIVE NUMERICAL MEASURES
3.1 The DESCRIPTIVE STATISTICS Analysis Tool
3.1.1 Measures of Location
3.1.2 Measures of Variability
3.1.3 Measures of Shape
3.1.4 Other Descriptive Measures
3.2 The RANK AND PER
Chapter 5: Measures of Variability
x
Suppose an Education Psychologist sampled 100 students from 3
different high schools & recorded their SAT scores
The 3 distributions, shown above, represent each school
In what way are these distributions similar, diff
CMV6120
Mathematics
Unit 21 : Applications of standard deviation
Learning Objectives
The Students should be able to:
Calculate standard score from a given set of data.
Determine, in the case of normal distribution, the percentages of data lying within a c
Chapter 5
Calculating the Mean and Standard Deviation
The mean and standard deviations are the most widely utilized statistical tools. They are
used to determine the central tendency (typical score) and variability (spread) of interval data.
Mathematicall
AP Statistics
Worksheet on Normal Distribution
Name:_
For each question, construct a normal distribution curve and label the horizontal axis. Then answer
each question.
1. The mean life of a tire is 30,000 km. The standard deviation is 2000 km.
a) 68% of
Skewness, Kurtosis, and the Normal Curve
Skewness
In everyday language, the terms skewed and askew are used to refer to
something that is out of line or distorted on one side. When referring to the shape of
frequency or probability distributions, skewness
Standard deviation
http:/en.wikipedia.org/wiki/Standard_deviation, From Wikipedia, the free encyclopedia
In probability and statistics, the standard deviation of a probability distribution, random variable,
or population or multiset of values is a measure
September 2014
8. STATISTICAL TECHNIQUES
Statistics are used in metrology to summarize experimental data, to provide the basis for assessing
its quality, and to provide a basis for making probabilistic decisions in its use. The essential basic
statistical
High School (grades 9-12) Mathematics Lesson
Sampling Distributions Activity
Submitted by Lisa Wood
[email protected]
Materials: Prepare a population of 100 index cards. Write on the cards as follows:
This activity comes from the book The Practice
Confidence Intervals
The standard deviation of a sampling distribution is called the standard error of the mean
(basically they are measures of sampling variability or estimates of dispersion or spread).
A standard error generally has a level of confidenc
Intro Mean, Median & Standard Deviation Exercises
1. A health food company employs 20 workers whose salaries (in dollars) are
14000 10000 16400 21795 17000 12000 18200 24500 16000 26000
17950 15000 18000 7000 16280 9050 9000 13500 19640 7620
Find the rang
RANDOM VARIABLES: probability distributions,
means, variances
Random Variable = Numeric outcome of a random
phenomenon
Discrete example: Consider a bag of 5 balls numbered
3,3,4,9, and 11. Take a ball out at random and note the
number and call it X, X is
STAT 515 - Chapter 6: Sampling Distributions
Definition: Parameter = a number that characterizes a
population (example: population mean ) its
typically unknown.
Statistic = a number that characterizes a
sample (example: sample mean ) we can
calculate it f
Name _
Period: _
Z-Score
1. A normal distribution of scores has a standard deviation of 10. Find the z-scores
corresponding to each of the following values:
a) A score of 60, where the mean score of the sample data values is 40.
b) A score of 80, where th
Statistics Normal Distribution Project
Name: _ Date: _ Period: _
Use the reaction timer given and collect reaction times for a sample of AT LEAST 30
different subjects taken from a homogeneous group (such as right handed high school
students).
For each su
Handout for week 2
Univariate Descriptive Statistics
(In this outline, if you see bold letters, you should know their definitions.)
Review: Parameters are _.
Lower-case Greek letters are used to denote parameters.
Statistics are _.
Roman letters are used
Tests of Hypotheses: z-test and t-test
0801-HypothesisTests.doc
Page 1 of 4
TESTS OF HYPOTHESES
As was mentioned earlier, sometimes we cannot survey or
test all persons or objects; therefore, we have to take a sample.
From the results of analysis from the
Standard Deviation Worksheet
Name_
What is standard deviation?
What does it tell us if an experiment had a low standard deviation?
What does it tell us if an experiment had a high standard deviation?
How do we calculate standard deviation?
Let's say we wa