To test hypothesis, regarding difference between sample mean (X line) and population mean (mu) on of two test can be used: the z test for one mean, or t-test for one mean
Z test is used when the population standard deviation (sideways q) for the variable
Chapter 1
Inferential Statistics is to test hypotheses about populations
Population - total # of participants that could potentially be included in research study
Independent variable: cause; Dependent variable: effect
Sample - subset of population from w
- to measure students on their vocabulary and comprehension skills, researchers use a software program called Read Naturally
- Number of words correct per minute (WCPM)
- a way to analyze data that have been collected is to calculate descriptive statistic
Ch7 Computations: (TESTING ONE SAMPLE MEAN)
Mean(X line)
(Add up all values)/N(number of values)
Standard Devaition(s)
Square root(summation(x^2)-(summation(x)^2/N)/(N-1)
State Null and Alternative
H0:mu=value
H1:mu=/=value
Calculate the degrees of freedo
Population - total # of participants that could potentially be included in research study
Sample - subset of population from where we collect data
Nominal: values differ in category or type
Ordinal: Value differ in relative quantity
Interval: Values equal
Exam 1 Study Guide
Chapter, Section, and Topic
1.1 Statistics, Science, and Observation
Definitions of Statistics be able to define and know the goals
Statistics consist of facts and figures such as average income, crime rate, birth rate and
average snowf
Exam 2 Study Guide (Using the textbook chapter sections as an outline)
Chapter 3
3.1 Overview (The Reason for Measuring Central Tendency)
Central Tendency: is a statistical measure to determine a single score that defines the center of a
distribution. The
EXAM 5 STUDY GUIDE (Chapters 9-11)
Chapter 9
1. Understand when a t statistic is used (instead of a z-score) for hypothesis testing.
-A t statistic is used in situations where the population variance (or standard deviation)
is not known. In this situation
Final Review
Ch1
Independent variable is cause, while dependent is effect
Study of college hypothesized that females with higher levels of depressive symptoms will likely engage in casual sex than females with fewer
Independent Variable: Levels of depress
If you do not reject the null, you dont need to determine level of significance.
If you do not reject null, research analysis did not support hypothesis.
Chapter 13
Linear relationship: a relationship between variables that is appropriately represented by
Whole one sided area under normal curve is .5
So entire curve is 1 or close to it
If table only gives from 0 to a certain number, add that to .5 to get everything under that statistic
Z score formula: z=X(given score)-u(mean/average)/q thing(standard devi
Stat 95 Udacity - Final Exam Study Guide
Note: The purpose of this study guide is to outline and summarize the main
concepts youll be tested on, but this guide by itself will not adequately prepare
you for the exam. To do well, you should review the video
Stat 95 Udacity Exam 2 Study Guide
Know the following definitions and concepts. Be able to recognize examples,
when applicable.
Know how population parameters and sample statistics are symbolized.
Properties of the Normal Distribution
The Normal Distribut
How-To Create Population Pyramids in Microsoft Excel
A population pyramid is a specifically formatted comparative histogram. To create this
histogram, you must first enter age and sex data into a spreadsheet, with the number of females
and the number of m
Stats 95 Assignment 1
1. Using your data from the Cookie Exercise, construct a frequency table with all four columns,
and construct a frequency graph of your data. Identify the type of data you are using, and
make sure you are using the correct graphing m
Chapter 11
Differences between the means of two samples was evaluated using the t test for independent mean
t=(Xline1-Xline2)/(Ssub(Xline1-Xline2)
The numerator is the difference between the means of two groups and is referred to as between-group variabil
Normal Distributions - distribution based on a population of an infinite number of scores calculated by a mathematical formula
4 distunguishing features: consist of infinite number of scores generated from mathematical formulas and tails go to infinity; U
Process of Hypothesis Testing
- State an initial assumption and a mutually exclusive alternative to this assumption
Initial assumption: Person did not commit crime
Alternative to Initial: Person did commmit
- Analyze the collected evidence(data)
- Make de
Get all questions and answers in this notepad from Exams 1-4
Exam 1:
1. Research hypothesis may be thought of as a prediction.
2. Independent variable is cause, while dependent is effect
3. Men are worse than wp,em. Main problem is:It doe not identify ind
- Bar graph is a figure in which bars are used to represent the mean of the dependent variable for each level of the independent variable
- the sampling distribution of the difference is the difference of all possible values of the difference between two
Chapter 10: Errors in Hypothesis Testing, Statistical Power, and Effect Size
Steps of Hypothesis Testing
1. State a research hypothesis regarding the relationship between variables and collect data to be analyzed
2. A null hypothesis states a hypothesized